key growing information

Growing Sweet Alyssum From Seed

How to grow sweet alyssum from seed: starting transplants or sowing direct, light and soil needs, spacing, cutting back for rebloom, and using the edible flowers.
By Hensley’s Seed Co.

Alyssum - Key Growing Information

Sweet alyssum flowers, an excellent food source for beneficial pollinators.

DAYS TO GERMINATION:

Expect sprouts in 8–10 days at 65–70°F (18–21°C).

SOWING:

Transplants are the most reliable: start seed 4–5 weeks before your planting-out date and move plants outside once frost danger is past. Drop a few seeds into each cell or pot and leave them uncovered, since light triggers germination. Grow seedlings cool, around 50–55°F (10–13°C) at night, to harden them. To sow outdoors instead, press seed onto the soil surface as early in spring as the ground can be worked, then thin when true leaves form. In mild-winter regions, sowings from midsummer through late winter can flower into June; where winter lows fall below 28°F (-2°C), wait and sow in early spring.

LIGHT PREFERENCE:

Full sun to partial shade.

PLANT HEIGHT:

8-16".

PLANT SPACING:

Space 6–8" apart.

HARDINESS ZONES:

Perennial in Zones 9–11; usually grown as an annual elsewhere.

HARVEST:

Pick edible flowers as soon as they open.

SOIL REQUIREMENTS:

Ordinary garden soil with good drainage.
pH: 6.0–7.0 is ideal.

USES:

A strong draw for beneficial insects; also suits edging, borders, bedding, rock gardens, window boxes and hanging baskets.

TIPS:

Bloom often slows in the heat of August. Shear plants back by about half and they will flower again when nights turn cooler.

SCIENTIFIC NAME:

Lobularia maritima

Source and attribution

Migrated library resource. Original named people, organizations, research, and factual provenance are retained.