How to Grow Lobularia Maritima Flowers in Your Garden

Welcome to our essential guide to growing and caring for Alyssum Carpet of Snow (Lobularia maritima) in your garden at home. This hardy annual is famed for its beautiful white flowers and heavenly honey scent. This popular border plant brings a thick carpet of snowy white blooms to the garden. In frost-free areas, these tiny flowers might even last the whole year. Here, I’ll take you through everything you need to know to grow Alyssum Carpet of Snow, including planting, soil considerations, light preferences, feeding, pruning, and over-winter care.

Lobularia maritima Plant Care Basics:

Botanical Name:	Lobularia maritima
Also Known As:	Sweet Alison, Sweet alyssum
Hardiness Zones:	USDA Zones 5-11
Flowering Months:	April to October or first frost
Growing Difficulty:	Low maintenance and easy to grow, especially for novice gardeners
Type of Plant:	Flowering deciduous annual in cooler climates. Short-lived flowering deciduous perennial in Zones 9 to 11
Light Requirements:	Enjoys full sun but appreciates partial shade in warmer regions
Temp & Humidity:	Thrives in most temperatures but does best between 50 and 60ºF. Likes low to medium humidity and can handle some drought
Watering Needs:	Must be watered regularly, about once a week, to keep the soil moist
Soil Preferences:	Needs well-draining chalky, loamy, or sandy soils with a neutral pH
Feeding:	Fertilize monthly with diluted liquid fertilizer in between flowerings
Growth Expectations:	Grows from 6 to 12 inches wide and tall
Toxicity:	Non-toxic to humans and animals

How to Grow Alyssum Carpet of Snow

What Are the Best Locations to Plant?

Alyssum Carpet of Snow is best placed in full sun to produce the best blooms, especially in cooler regions. The plant will need shade protection from the intense afternoon sun in hotter areas. A spot providing at least six hours of morning sunlight daily is ideal.

The soil should drain well and be slightly loose. Chalky and sandy soils are best for this and should have a neutral pH.

What Are the Best Times of Year to Plant?

Alyssum Carpet of Snow does best when planted after the final spring frost. Seeds can be started six to eight weeks before the last spring frost. These can be planted out when the soil begins to warm up.

Growing From Seed Vs. Planting Young Nursery Plants

For earlier planting, start the seeds off indoors about six to eight weeks before your final spring frost. Once the seedlings have emerged and have a couple of pairs of leaves, they can be planted outside.

Seeds can be sown directly into the ground after that last frost in warmer regions. However, the soil must have reached a minimum temperature of 60ºF (16ºC).

You’ll typically find Alyssum Carpet of Snow being sold as a bedding plant at nurseries. This provides a quicker way to get instant color into your borders or displays. Again, make sure the last spring frost has finished before planting out.

What to Do Before Planting

Before planting Alyssum Carpet of Snow, you can engineer the soil for the best results. Remove all traces of weeds from the soil and rake it over. Add some organic matter, such as compost, to help boost the nutrients in the soil.

Suppose you’re planting an Alyssum Carpet of Snow as part of a border or display; account for its mature size. This helps make sure that the other plants have enough space as well.

What’s the Best Soil?

Alyssum Carpet of Snow thrives best in loose, well-draining soils. Ideally, these should be chalky, loamy, or sandy. These annuals are drought-tolerant but still like some moisture in their growing medium. Alyssum Carpet of Snow prefers soils with a neutral pH of around 6.0 to 7.0.

How to Plant

For established seedlings and bedding plants, start digging holes large enough for the root ball. Then, place the plants in and fill them with some soil and compost. Allow for at least 6 inches between each plant.

You can also plant Alyssum Carpet of Snow in containers. Provide some nutrient-rich, well-draining loose soil. If planting multiple specimens in the container, provide each plant at least 6 to 12 inches of room.

Light Preferences

In cooler climates, Alyssum Carpet of Snow needs full sun for most of the day. In warmer regions, provide some shelter from the intense afternoon sun. The plant needs at least six hours of sunlight every day.

Temperature & Humidity Preferences

Alyssum Carpet of Snow can thrive in a range of temperatures. The sweet spot is between 50 and 60ºF (10 to 15.5ºC). The plant will stop flowering in hotter regions if it gets too warm.

Alyssum Carpet of Snow thrives in moderate humidity. The soil needs to be kept slightly moist, but these plants are also drought-tolerant.

How to Care For Alyssum Carpet of Snow

When and How to Water

Water Alyssum Carpet of Snow just enough to keep the soil slightly moist most of the time. If the top two inches of soil feel dry, give the plant an inch or two of water, in drier, hotter climates, water a little more often.

How, When, and Why to Fertilize

Alyssum Carpet of Snow won’t need a lot of feeding. If your soil doesn’t have a lot of nutrients, add a slow-release fertilizer when you first plant the specimen. 

Once each round of blooms has ceased, feed the Alyssum a monthly dose of diluted liquid fertilizer. This sets the plant up for its next flowers.

Pruning & Cutting Back

Deadhead Alyssum Carpet of Snow regularly to keep new blooms coming through. If the plant stops flowering in hot conditions, use some shears to remove about a third of the foliage. This stimulates the plant to prepare for more growth when temperatures drop. 

Propagation

Once an Alyssum Carpet of Snow has flowered, cuttings can be taken. Trim away the lower leaves and plant the cutting into a pot. Keep it somewhere shaded with a glass covering until the following year.

Alyssum Carpet of Snow can also self-seed, with new flowers popping up the following year. Take care that the seeds don’t spread through your garden if this isn’t desired.

Overwintering

In most climates, Alyssum Carpet of Snow is an annual and won’t need overwintering. These plants can survive outside in the winter without a hard frost. Bring container plants indoors to protect them.

When and How to Repot

Alyssum Carpet of Snow grown in a container typically won’t need repotting. These annuals often die off in the winter unless allowed to self-seed. Replace them the following spring. 

Common Problems & How to Treat Them

Underwatering

Although drought-tolerant to a degree, these plants will die if underwatered. Drooping foliage and bone-dry soil are dead giveaways. Increase your watering schedule to revive the plant.

Overwatering

If too much moisture is held in the soil, Alyssum Carpet of Snow can suffer from root rot and diseases like botrytis blight. Only water the plant if the top two inches of soil feel dry.

Too Much Light

In hotter areas, too much intense afternoon sunlight can burn the foliage. Browning on the leaves indicates this. Place the plant somewhere that gets some shade during the afternoon.

Common Pests & Diseases

Botrytis blight

Botrytis blight occurs when there’s too much water in the soil. Gray mold and discolored, spotted, or wilting leaves are symptoms. Remove afflicted parts of the Alyssum and avoid watering until the top two inches of soil are dry.

Slugs

These garden pests will eat the vulnerable young shoots of Alyssum Carpet of Snow. Start seedlings indoors to make sure they’re strong enough to resist slugs. Alternatively, use a beer trap to catch and kill wandering slugs.

Essential Tools to Have Around

Here are all of the tools you should have around for Alyssum Carpet of Snow care. 

• Watering can
• Secateurs
• Garden shears
• Trowel

Wrap Up

Alyssum Carpet of Snow is a low-maintenance bedding plant ideal for filling out borders. Its ease of care allows even beginner gardeners to get some immediate impact in their garden. What’s great is these hardy plants can survive in different growing zones, making it easy to incorporate them in most climates.