The best way to Plant, Develop, and Take care of ‘Rosie O’Day’ Candy Alyssum

Candy alyssum is a dainty, low-growing floor cowl. ‘Rosie O’Day’ is a combined pink model of the traditional white everybody is aware of and loves. On this article, I’ll focus on find out how to plant, develop, and look after it. 

Let’s get began. 


Close-up of a flowering 'Rosie O'Day' Sweet Alyssum plant in a garden with a blurred background. The plant features dense clusters of tiny, fragrant flowers that bloom in delicate shades of pink. Its narrow, lance-shaped leaves form a lush backdrop to the profusion of blossoms.

Botanical Identify 

Lobularia maritima

Plant Kind 

Perennial flowering floor cowl typically grown as an annual


Brassicaceae (mustard)


Pollinators, beneficials

Particular Traits

Edible flowers, candy perfume, drought resistant 

Native Space 

Mediterranean area 


Full solar to partial shade

Watering Necessities 


Alternate Identify

Alyssum, candy Alison, carpet flowers 


Bagrada bug, caterpillars, aster leafhopper 


Root rot and wilt, downy mildew, botrytis blight, leaf blight

Hardiness Zones

5-9, perennial in Sep 11

Bloom Time

Spring till frost 

Rosie O’Day Candy Alyssum Seeds

Rosie O'Day Sweet Alyssum Seeds

What Is It? 

Candy alyssum is a short-lived perennial in zones Sep 11 or an annual in zones 5-9. It’s a low-growing floor cowl within the mustard household native to the Mediterranean areas that vary in colours from white to shades of pink and purple.

Their tiny, dainty flowers are non-toxic and used as garnish on platters, soups, and desserts. ‘Rosie O’Day’ alyssum was an All-America Choices award winner in 1961. It’s a rosy pink model of everybody’s favourite companion plant.


Close-up of rosie o' day plants in bloom against a blurred green background. The blooms are enchanting, showcasing a plethora of dainty flowers adorning the plant in profuse clusters. Each bloom is petite and boasts soft, pastel pink petals that exude a delicate allure. These blooms form dense clusters atop short stems, creating a captivating display of color and fragrance against the backdrop of the plant's lush, lance-shaped foliage.
These crops kind a lush carpet of pink-magenta flowers.

‘Rosie O’Day’ grows as much as 12 inches in peak with a 6-12 inch unfold. It options tiny, four-petaled flowers starting from delicate pink to magenta with delicate yellow facilities, rightfully nicknamed carpet flower because it varieties a carpet of lush florets. The leaves are medium inexperienced, lengthy, oval, and slender. 

This flower grows properly alongside retaining partitions, in rock gardens, or in fairy gardens. ‘Rosie O’Day’ will spill over partitions and rocks, fill in cracks and crevices, and be abuzz with pollinators, filling the air with a candy perfume. 

Standout Characteristic

Close-up of a small bee sitting on a  flower in a sunny garden. The flowers are tiny, four-petaled, with small purple-pink petals and yellow stamens, borne in clusters on short stems.
Entice numerous pollinators and useful bugs like hoverflies and ladybugs with this pink floor cowl.

Pollinators of all sizes and styles are drawn to this plant, like hummingbirds, butterflies, bumblebees, and honeybees. Nonetheless, little guys like hoverflies adore the tiny flowers as a result of it’s straightforward for them to achieve the candy nectar. 

‘Rosie’ serves as an insectary plant and attracts useful predators to the realm, which can feed on pests like aphids. 

The best way to Develop

Alyssum is low-maintenance and might adapt properly to several types of soil and climates. It matures in 60-90 days from sowing. Let’s focus on find out how to look after this easy-growing plant.

Daylight Necessities 

Close-up of 'Rosie O'Day'  plants in bloom under sunlight in a garden. The clusters are exquisite, featuring an abundance of tiny, delicate flowers that form dense, rounded clusters atop short stems. Each cluster is composed of numerous small blooms and they are held closely together, creating a profusion of soft pink color.
Alyssum thrives in full solar to partial shade, rising all through the season.

In case you have a spot in your backyard that receives full solar to partial shade, alyssum will thrive. Although it could peter out within the peak of summer season, it’s going to develop all season lengthy with the best situations. In hotter zones, some afternoon shade will profit the plant. At the least six hours of direct solar is required in cooler zones.

Water Necessities 

Macro of blooming inflorescence (Lobularia maritima) with water drops on a blurred garden background. The plant produces an upright small inflorescence of tiny pale pink four-petaled flowers with yellow stamens at the centers.
Drought-resistant ‘Rosie O’Day’ wants one inch of water per week.

Whereas ‘Rosie O’Day’ is drought-resistant as soon as established, it ought to obtain one inch of irrigation per week if no rainfall has occurred. Carry out the finger take a look at by sticking two fingers into the soil as far down as you may. They need to come out with about two inches of moist soil on them, and if not, it’s time to water.

Soil Necessities 

Close-up of a man's hands holding soil in a garden bed. The soil is loose and dark brown. The gardener's hands are stained with soil.
Use well-draining soil, add backyard grit if essential, and keep pH between 6.0-7.0.

Soil will be wealthy, sandy, or loamy, nevertheless it should be well-draining, or root rot can happen. Add somewhat backyard grit to assist with drainage if wanted. Take a look at the soil and amend it to get the pH between 6.0 and seven.0. Hold the soil moist all through the season. It may not appear to be a lot in the course of the summer season, however blooms ought to return within the fall. 

Alyssum received’t want amendments in its soil until the soil is compacted and doesn’t drain properly. An excessive amount of fertility will not be good for the general efficiency of this plant.


Close-up of flowering groundcover  in a sunny garden. Its foliage consists of small, lance-shaped leaves that form dense mats, providing a lush backdrop for the abundant flowers. The flowers themselves are tiny, and they form dense clusters atop short stems. These blooms are a bright shade of pink.
Mulching ‘Rosie O’Day’ alyssum is non-compulsory however can suppress weeds and funky soil.

Offering mulch for ‘Rosie O’Day’ will not be essential until it’s a part of your backyard design. Alyssum can function a mulch below different taller shrubs, bushes, and perennial flowers as soon as they begin to cowl the bottom, suppressing weeds and holding the soil cool

Local weather and Temperature Necessities

Close-up of a flower bed with  a charming low-growing annual plant that delights with clusters of tiny, fragrant flowers. Its dense mats of delicate, lance-shaped foliage serve as a lovely backdrop for the profusion of small, soft pink blooms that cover the plant.
The blooms seem primarily in spring and fall.

Most flowering happens within the cooler temperatures of spring and fall. The plant can stand up to temperatures down to twenty-eight°F (-2°C). If a frost is within the forecast, add a layer of row cowl to maintain the crops protected. Most well-liked temperatures are between 50 and 60°F (10-16°C). ‘Rosie O’Day’ might peter out a bit within the peak of summer season.

‘Rosie O’Day’, like most alyssum cultivars, is generally grown as an annual in cooler areas. It’s straightforward to start out from seed and could also be finest as an annual. That’s as a result of it may well get leggy in its second 12 months when grown as a perennial. Nonetheless, it may be grown as a winter-blooming perennial in zones Sep 11. 


Close-up of a gardener's hand in a yellow glove pouring liquid fertilizer from a yellow bottle into a blue watering can in a sunny garden. There is a watering can on the ground among the flowering Sweet Alyssum plants.
Apply phosphorus-rich, nitrogen-low natural liquid fertilizer each 3 weeks in spring and fall.

Alyssum responds finest to fertilizer within the spring and fall to coincide with its peak bloom intervals. Add an natural liquid fertilizer diluted to 1/4 energy one or two instances within the season, stopping as soon as temperatures go above 50°F (10°C) when it stops uptaking vitamins.

Select one which’s excessive in phosphorus and low in nitrogen. Apply after irrigating or rainfall. At all times check with the directions on the packaging of the fertilizer you might be utilizing.


Close-up of flowering 'Rosie O'Day' Lobularia maritima plants against a blurred background of a sunny garden. This cultivar showcases dense clusters of tiny, fragrant flowers in delicate shades of pink, creating a picturesque carpet effect. The narrow, lance-shaped leaves provide a verdant backdrop to the profusion of blossoms.
Choose ‘Rosie O’Day’ by snipping full stems, making a romantic yard bouquet.

Harvest full stems of ’Rosie O’Day’ by snipping them close to the bottom with clear, sharp shears. Add it to a mason jar with some sprigs of decorative grass and some vibrant, disc-shaped flowers for a romantic yard bouquet

‘Rosie O’Day’ will add an earthy, mustardy taste when used as an edible garnish. Harvest healthy-looking flower clusters once they’re in full bloom. It’s also possible to snip off complete stems, relying on what number of you want. 


Close-up of Lobularia maritima in bloom in a sunny garden. The clusters of flowers present a picturesque sight with their dense and abundant blooms. Each cluster consists of numerous tiny flowers that form a carpet-like effect when in full bloom. These delicate flowers come in various shades including soft pink and hot pink shades, with four petals arranged in a cross shape.
‘Rosie O’Day’ doesn’t want it however appreciates mild pruning for brand new progress.

This plant doesn’t require any pruning. Nonetheless, in the event you discover a number of brown petals and wish to freshen it up, a mild prune will likely be appreciated and would encourage new progress. Any useless and diseased areas of plant must be pruned as you discover them.

Amassing Seeds

View of a flowering 'Rosie O'Day'  plant with seeds. The flowers are charmingly delicate, presenting clusters of petite, soft pink blooms atop short stems. These clusters create a picturesque carpet of color against the backdrop of the plant's dense mats of lance-shaped foliage. As the blooms fade, they give way to slender seed pods, which develop in a green hue before maturing to a light brown color.
Accumulate mature seeds from decrease clusters and retailer them in a dry place.

Scout for seeds on decrease, extra mature flower clusters as seed pods will kind there first. They’ll be brown and dry, like small, barely flatter coriander seeds. Gently tug the stem off the plant or snip it off. Roll the stems gently between your fingers to launch the seeds from the pod. Do that over a colander, paper towel, or bowl to simply separate the seeds from the remainder of the stems. 

If it’s late within the season and the plant has began to die again, raise the plant stems, sweep the seeds out from the soil floor, and separate them from plant particles. Guarantee seeds are 100% dried earlier than including them to a fabric bag, brown bag, or plastic container, and retailer them in a cool, dry place in your house. Label them with the variability and 12 months. 


Whereas dividing will not be really useful, you may develop this plant by seed, cuttings, or permit the crops to self-seed. Having extra alyssum to plant in your backyard is all the time a plus!

Beginning From Seed

Close-up of Alissum sprouts in a flower bed with wet soil. The sprouts have thin vertical stems with two green cotyledons, round in shape.
Develop ‘Rosie O’Day’ seeds indoors earlier than the final frost and supply mild for germination.

Sow seeds indoors 4 to 5 weeks earlier than the final frost and place them below lights or on a windowsill. Mild is required for germination, which can take 5-15 days

Backside water your cell trays or containers to maintain the seeds in place and preserve the soil moist. Direct sow by sprinkling 15-20 seeds each foot. Skinny as wanted, nevertheless it’s actually not essential. The plant enjoys rising in lots of residing mulch.  

Professional tip: In delicate climates, seeds will be sown within the fall for winter blooming.

From Cuttings

Close-up of a Sweet Alyssum seedling in a small pot on a white background. Sweet Alyssum leaves are small, narrow, and lance-shaped, arranged alternately along the stem. They have a vibrant green color and a slightly fuzzy texture.
Snip stem cuttings, plant in contemporary soil, preserve moist, and transplant when rooted.

Create new crops from cuttings by snipping the highest 4 inches from a couple of stems and putting them into contemporary soil. Hold them well-watered and guarded as they kind new roots. While you tug the stem gently and there’s resistance, roots have fashioned.

Transplant them outside when roots are ample and wholesome, or place them in a container to permit them to proceed rising. Cuttings are really useful for hotter areas the place this plant grows as a perennial.


Close-up of a flower bed with  plants in bloom. The Alyssum plant, characterized by its low-growing and spreading habit, features dense clusters of tiny, fragrant flowers that bloom abundantly in various shades of white and pink, each with four petals forming a cross shape. These delicate blooms adorn the plant's lush foliage, which consists of small, narrow, and lance-shaped leaves arranged alternately along the stems. The flowerbed is fenced with stones.
Take away undesirable self-seeded seedlings to stop white flower reversion.

It is a prolific self-seeder, however most hybrids will revert to white flowers the next season. Pull up any undesirable shallow-rooted candy alyssum seedlings that germinate. Try to be diligent about this if you wish to plant one thing else in that spot subsequent season.


Alyssum isn’t fussy when transplanted and will be finished within the spring or fall. Bear in mind to harden off your seedlings and be light within the transplanting course of. These crops don’t have additional delicate roots, although.

Hardening Off 

Top view of seedlings in black pots. The plant produces slender stems and lance-shaped leaves arranged alternately along the stem. The leaves are typically a vibrant green color and have a slightly fuzzy texture. it produces clusters of tiny flowers in white, soft and deep pink.
Guarantee seedlings are hardened off at 50°F (10°C) and shield from late frosts to stop injury.

Harden off seedlings at round 50°F (10°C) earlier than transplanting to allow them to acclimate to outside situations. Shield seedlings within the occasion of any late spring frost. They’ll deal with temperatures down to twenty-eight°F (-2°C), however younger seedlings are particularly susceptible to dying by frost. 


Ideally, spacing of transplants must be six to eight inches. In case you are utilizing candy alyssum to cover the soil floor of annual greens resembling tomatoes, more room will likely be appreciated for good airflow. Much less is okay in gardens the place you wish to cowl the soil shortly, however you’ll discover repairs requires extra effort.


Close-up of a woman's hand with red nails and a silver-black wristwatch holding an Alyssum seedling against a blurred background of flowering Alyssum plants. The seedling is young and consists of a root ball and several young flowering plants. The flowers are small, star-shaped, consisting of four tiny round petals in shades of white and purple.
Transplant ‘Rosie O’Day’ after frost threat, relocate established crops to sunny, well-draining spots.

After correctly hardening off, transplant ‘Rosie O’Day’ after the danger of frost has handed. Keep away from doing so within the warmth of summer season because the roots received’t have time to regulate to the nice and cozy soil temperatures, and require additional water to ascertain. 

You possibly can transfer established crops to a brand new place in your backyard or reward to a pal or neighbor. Guarantee soil is well-draining and it receives Full solar. Fertilizer will be added at the moment. Water properly till it’s established. 

Professional tip: Don’t let the soil get soggy when planting alyssum in containers.

Plant Makes use of

The fragile pink flowers of ‘Rosie O’Day’ will complement many flowers, crops, and bushes you may have rising in your backyard. It does nice in containers and on sloped land.

Design Concepts

Close-up of a flowering  plant in a large terracotta hanging pot in a sunny garden. Lobularia maritima, presents a picturesque sight with its dense clusters of tiny, delicately scented flowers in pink hues. The narrow, lance-shaped leaves provide a lush backdrop to the profusion of bloom.
Develop ‘Rosie O’Day’ in window packing containers, containers, or on slopes for a aromatic, pollinator-friendly backyard.

‘Rosie O’Day’ will create rolling folds of pretty pink flowers over retaining partitions. This plant seems nice in window packing containers, and also you’ll love smelling its perfume when it’s positioned in a container close to your entrance door.

Attempt it as an understory in your cottage backyard. Sprinkle seeds between massive patio stepping stones, or add it to a pollinator backyard. Bought sloped land? Throw some seeds there as a substitute of grass for a pollinator-friendly space. Develop it with numerous herbs resembling lavender, rosemary, and Russian sage, or alongside a walkway or backyard border. 

Insectary Plant

Close-up of a flowering plant Alysson maritime against the backdrop of growing spinach in a sunny garden. This plant features small, lance-shaped leaves that are densely packed along its stems, creating a lush and compact foliage. The plant produces clusters of tiny, fragrant flowers of delicate pink color.
Plant alyssum close to greens to draw useful bugs for pest management.

Place alyssum close to vegetable crops, and also you’ll discover them buzzing with parasitic wasps, hoverflies, and minute pirate bugs, all of that are extraordinarily prolific predators of a number of damaging backyard pests.

Research present when candy alyssum is intercropped with sure greens, the populations and total well being of some beneficials improve. This results in higher management of backyard pests like aphids, spider mites, moths, mealy bugs, and numerous pest eggs. 

Companion Vegetation 

An overhead view of a blooming Rosie O'Day Alyssum among grey-green cineraria foliage. The clusters of Rosie O'Day Alyssum are abundant and compact, boasting a profusion of tiny, fragrant flowers in delicate shades of pink. Cineraria leaves are characterized by their soft, velvety texture and striking silver-gray coloration. The leaves are broad and rounded with scalloped edges.
Increase pollination for peppers, eggplant, and tomatoes whereas deterring weeds and pests.

Candy alyssum might improve the speed of pollination of annuals like peppers, eggplant, and tomatoes. Moreover, it’s going to suppress weeds and entice pollinators and beneficials, which can result in decreased pest stress.

Edible Flowers

Close-up of a cluster of pink Alyssum flowers on a blurred green background. A cluster of pink Alyssum flowers presents a charming sight with its numerous small, delicate blooms tightly packed together, forming a profusion of soft pink hues. Each individual flower showcases four petals that create a dainty, star-like shape, complemented by a central cluster of yellow stamens.
Use the flowers as a salad garnish, or in desserts, pasta, or cocktails.

This beautiful flower is edible! Add the mustardy flowers as a garnish in salads or stews. Additionally they add a fragile characteristic to a white cake, atop a summer season pasta dish, or floating in a cocktail. 

Widespread Issues

Listed below are a couple of pests and illnesses to concentrate on, though they aren’t enormous threats to candy alyssum. Whereas these pests are sometimes a menace on younger crops, and in massive numbers, mature crops have little difficulty with them.


Painted bug or Bagrada bug (Bagrada hilaris)

Close-up of many painted bugs on green lanceolate leaves in the garden. Bagrada hilaris, commonly known as the painted bug or harlequin bug, is a small, brightly colored insect characterized by its striking black and orange-red markings on its shield-shaped body.
The Bagrada bug, a smaller stink bug, harms mustardy crops, inflicting recognizing and wilting.

This bug is a kind of stink bug that loves mustardy crops. It seems like a tiny Harlequin bug with related black, white, and orange markings, and a shield-shaped physique, however about half the dimensions. Nymphs resemble woman beetles nymphs, which hatch out within the spring and fall. This pest thrives within the warmth of summer season, hiding within the soil throughout cooler components of the day.

Bagrada bugs pierce plant tissues to feed on the insides. Signs embody recognizing, stunted progress, wilting, or dying. Scout early for early detection, preserve your soil wholesome, and use lure cropping to stop an infestation. Infested crops must be promptly eliminated and the realm saved weed-free.


Close-up of several Diamondback moth larvae on a green leaf in the garden. Diamondback moth larvae, referred to as cabbage worms, are small, pale green caterpillars with a distinctive diamond-shaped pattern along their backs, hence their name. These larvae have a cylindrical body with three pairs of true legs near the head and several pairs of prolegs along the abdomen. Their appearance is characterized by tiny hairs covering their bodies and a slightly tapered rear end.
Scout early for diamondback moth larvae and cabbage loopers.

Any caterpillar will be damaging within the backyard, however diamondback moth larvae and cabbage loopers are two that may trigger some severe injury. They chew round holes in leaves, giving them a shothole impact, and chew by means of the leaf tissue, respectively.

Scout early and toss any discovered right into a jar of soapy water. Crop rotation, insect netting in the course of the correct life cycles of assorted caterpillars, and a tidy backyard ought to lower the danger. 

Aster leafhopper (Macrosteles quadrilineatus)

Close-up of Macrosteles quadrilineatus, commonly known as the aster leafhopper, on a green leaf. This is a small insect with a slender body typically measuring around 4-5 millimeters in length. It features distinctive greenish-yellow coloring with four prominent dark lines running along its wings, giving it a striped appearance. The aster leafhopper's wings are clear with a delicate network of veins.
Be careful for tiny grayish-green hoppers that unfold aster yellows, inflicting a mottled plant look.

These pesky hoppers can transmit Aster Yellows to wholesome crops, and sadly, they’re exhausting to identify at ⅛ inch in dimension and grayish-green. Their most popular host crops vary broadly, so there are many issues you may have within the backyard they’ll probably like to feed on. They trigger a mottled look after sucking out the juices of crops.

Two to 3 generations of nymphs might hatch out per season, occurring in June and July. Take away doable weed hosts and search for signs of aster yellows in surrounding crops.

‘Rosie O’Day’ is secure from deer and rabbit injury. 


Root rot and wilt

View of Alysson maritime with yellowing leaves in the garden. 'Rosie O'Day' a delightful groundcover, boasts dense clusters of tiny, fragrant flowers in delicate shades of pink, creating a picturesque carpet effect. Its narrow, lance-shaped leaves form a dense green mat, providing an attractive backdrop to the profusion of blooms.
Rhizoctonia solani causes root rot, resulting in yellowing, wilting, and collapse.

Root rot is brought on by Rhizoctonia solani, which proliferates when the foundation beneath the floor can’t breathe. This is because of compacted soil, an excessive amount of water, or too dense of a planting. Above-ground signs embody yellowing, wilting, and foliar collapse.

In case you have heavier soil, reduce water and use a soil moisture meter to keep away from overwatering. Vegetation is not going to probably survive root rot and must be eliminated.

Downy mildew

Close-up of a flowering 'Rosie O'Day' plant with Downy mildew diseased leaves. The plant has clusters of tiny pink flowers composed of multiple tiny petals. Its lance-shaped leaves are small and green, providing a lush backdrop to the delicate blossoms. The leaves have yellowish-gray spots.
Yellowing leaves point out DM by Peronospora, resulting in fuzzy spots and potential plant dying.

Higher leaf yellowing might point out downy mildew, brought on by Peronospora. Fuzzy mildew spots will kind because the an infection breaks by means of the leaves. Leaves will shrivel up, and if the an infection persists, crops might die.

Hold crops wholesome and water within the early morning to keep away from moist foliage going into the night time. This decreases the danger of fungal exercise and fungal illness. Give crops ample house and supply good airflow. 

Botrytis blight or grey mould

Close-up of flowering  plants whose leaves are affected by gray mold. A charming annual plant, showcases clusters of petite, delicately scented flowers of bright white color. Its small, lance-shaped leaves create a lush green backdrop, accentuating the profusion of blooms that adorn the plant. Some leaves are covered with a grayish-brown coating.
Botrytis cinerea causes grey mould in moist areas.

Grey mould is a threat when alyssum is grown in moist areas and is brought on by Botrytis cinerea. When browning begins on the internal edge versus the outer fringe of the flower, the plant is probably going experiencing grey mould. You might also see massive areas of fuzzy, grey spores, and a few leaves might drop and die.

Follow good sanitation in your backyard, together with altering gloves and cleansing instruments. Additionally, clear up backyard particles, together with fallen leaves and any contaminated crops.

Leaf blight

 Flower close up. The plant has a cluster of tiny purple-pink flowers with rounded petals. The leaves are narrow, lance-shaped, pale green.
Stop blight with high quality seeds, humidity management, drip irrigation, and sanitation.

Usually brought on by moist situations and humidity, blight causes yellowing in all areas of a plant and might finally trigger dying. Supply your seeds from respected sources, management humidity ranges, use drip irrigation, and observe good sanitation in your backyard to stop it. Copper-based fungicides could also be used as preventatives earlier than prolonged intervals of rain and humidity.

Ceaselessly Requested Questions 

Yellowing is probably going brought on by pests like mealybugs, aphids, and leafhoppers. Pay shut consideration although as yellowing is commonly an indication of one thing severe like downy mildew or root rot.

Ultimate Ideas

‘Rosie O’Day’ is an enthralling pink groundcover that may be grown as an annual or perennial, relying in your area. It’s versatile in its makes use of and is adaptable to completely different climates and soil varieties. Look no additional for low-maintenance and useful floor cowl.

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