Lobularia maritima Snow Crystals
Lobularia maritima Snow Crystals
Lobularia maritima Snow Crystals
Lobularia maritima Snow Crystals
Lobularia maritima Snow Crystals
Sweet Alyssum, Sea Alyssum, Snow-white carpet, Sweet Allison, Snow in Summer, Snowdrift
They are magnificent this year, and even in late September, they are still flowering and spreading a sweet, honey-like fragrance.
Marie-Rose , 23/09/2025
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Description
The Lobularia maritima procumbens, also called Alyssum Snow Crystals or Sweet Alyssum, is a robust annual ground cover plant with beautiful flowers. It grows quickly, forming uniform snowy carpets with large, immaculate flowers that cover its compact vegetation perfectly. These fragrant and cushion-like mats are perfect for borders, rock gardens, hanging baskets, and flower pots. Despite its delicate appearance, this small plant is highly resilient and can withstand adverse weather conditions and drought.
Sweet Alyssum is an annual plant belonging to the Brassicaceae family, like mustard and rapeseed. It is native to southern Europe and the Mediterranean region. This plant is widely cultivated in gardens and has given rise to many ornamental horticultural varieties. Alyssum 'Snow Crystals' is a herbaceous woody-based tuft that can grow up to 15 cm (5.9 in) tall and 25 cm (9.8 in) wide. It may look like a weed at first, but then it transforms into an imposing clump of branched stems. It is adorned with petite, glaucous green, alternate, simple, and entire leaves that are narrow (from lanceolate to linear) and quite hairy. It blooms from June to September, covering the plant with white flowers with a delicious honey fragrance.
Despite their versatility and ability to establish themselves easily in the sun and well-drained soils, sweet alyssums are often overlooked in garden designs. These plants thrive in well-drained soil and sunshine, making them ideal for covering the tops of walls alongside aubrietas or Alyssum 'Basket of Gold,' filling spaces in rockeries at the base of drought-tolerant shrubs like lavender, rock roses, shrubby salvias, or rosemary. Planted along pathways, sweet alyssums add a charming touch to the garden. Lobularia 'Crystal Snow' can be grown in pockets between wall stones and form immaculate cascades that pair well with garden irises or wall bellflower Campanula portenschlagiana for a stunning vertical display. Sweet alyssums work wonderfully in pots and flower containers and combine well with surfinias, calibrachoas, or even ivy geraniums.
Note: Our plug plants are intended for experienced gardeners. Upon receipt, transplant and store them in a sheltered area such as a veranda, greenhouse or a cold frame with a temperature above 14°C for a few weeks before planting them outdoors. Wait until the risk of frost has passed before planting them outside.
Lobularia maritima Snow Crystals in pictures
Flowering
Foliage
Plant habit
Botanical data
Lobularia
maritima
Snow Crystals
Brassicaceae
Sweet Alyssum, Sea Alyssum, Snow-white carpet, Sweet Allison, Snow in Summer, Snowdrift
Cultivar or hybrid
Planting and care
Young plug plants benefit from being transplanted into individual pots to help them become stronger before being permanently planted outdoors. It is important to protect them from frost. Once they have gained enough strength, you can plant your 'Crystal Snow' Lobularia in a spot that receives plenty of sunshine or partial shade, either in pots or in the ground. These plants are easy to grow and thrive in light, neutral to alkaline soil. Adding well-rotted compost to very poor soil can also be helpful. They can tolerate dry soil quite well and are resistant to heat. If you choose to plant your alyssums in pots, make sure to water them regularly.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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