Sweet Alyssum

What is sweet alyssum?

Sweet alyssum (Lobularia maritima) is a fragrant herb belonging to the mustard family. Native to the Mediterranean region, it is commonly grown as an annual or short-lived perennial ornamental plant for garden borders.¹²

The plant is characterized by narrow, gray-green leaves covered in fine, silvery hairs. It produces clusters of small, four-petaled flowers that are typically white, though horticultural varieties can feature lavender, pink, or purple hues. These flowering stalks generally reach heights of up to 30 cm (1 foot). As the plant matures, it develops small, round seedpods known as silicles along the stems beneath the flower heads.¹²

What other plants belong to the mustard family?

The Brassicaceae family, commonly known as the mustard family, is a diverse group of over 4,100 species that includes many essential food crops and popular ornamental plants.³⁴

Agricultural Crops

Many members of the genus Brassica have been extensively domesticated for human consumption. These include:³⁴

• Cruciferous Vegetables: Broccoli, cabbage, cauliflower, Brussels sprouts, kale, kohlrabi, collard, and napa cabbage.³⁴
• Root and Stem Crops: Radish, turnip, rutabaga, and horseradish.³⁴
• Other Staples: Arugula, watercress, wasabi, maca, and various mustard seeds.³⁴

Ornamental Plants

Beyond food, many species are cultivated for their showy, cross-shaped flowers. Notable ornamentals include:⁴

• Sweet alyssum
• Wallflower
• Rock cress
• Candytuft
• Stock
• Basket-of-gold
• Honesty
• Dame’s rocket
• Stonecress

Additionally, the model organism Arabidopsis thaliana is a member of this family and is widely studied in plant biology.⁵

How do pollinators interact with sweet alyssum?

Sorry, the Britannica knowledge base does not contain this information.

What are the differences between annual and perennial plants?

The primary difference between annual and perennial plants lies in the duration of their life cycles.

Annual Plants

An annual is a plant that completes its entire life cycle within a single growing season.⁷ For these plants, the seed is the only part that survives from one season to the next. They are categorized as either summer annuals, which germinate and seed within the same year, or winter annuals, which germinate in the autumn and complete their cycle by the following spring or summer. Many important food crops, such as cereal grains, peas, and lettuce, are annuals.⁷

Perennial Plants

A perennial is a plant that persists for several years. These plants typically regrow and rebloom year after year, often utilizing specialized underground structures like bulbs, rhizomes, or tubers to survive cold climates. All trees and shrubs are perennials, as are many herbaceous plants and economically significant crops like apples, grapes, and asparagus.⁸⁹