Crop Rotation Group
Miscellaneous
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Soil
Fertile yet sharply drained soil with a neutral to slightly alkaline pH.
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Position
Full sun to part afternoon shade in hot summer areas.
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Frost tolerant
Yes. Wallflowers survive winter temperatures to 5°F (-15°C), and grow as short-lived perennials in mild winter climates.
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Feeding
Drench with a liquid organic fertilizer when plants show vigorous new growth in spring.
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Companions
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Spacing
Single Plants: 11" (30cm) each way (minimum)
Rows: 11" (30cm) with 11" (30cm) row gap (minimum)
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Sow and Plant
Start seeds in late spring, sowing the seeds where you want the plants to grow. Wallflowers that become established in late summer bloom very heavily the following spring. Plants that persist as perennials, including the shrubby ‘Winter’ series, can be propagated by rooting stem cuttings taken in early spring. Where summers are hot, wait until late summer or early fall to sow wallflower seeds, and grow the plants as winter annuals.
Our Garden Planning Tool can produce a personalized calendar of when to sow, plant and harvest for your area.
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Notes
Wallflower varieties vary in color, size, fragrance and growth habit. Most wallflowers bloom yellow, orange or red, but ‘Bowles’s Mauve’ (Erysimum x linifolium) produces upright spikes of pink flowers over a long period. In the garden, wallflowers perform well with tulips and forget-me-nots.
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Harvesting
Enjoy the fragrance of wallflowers by using them as cut flowers. The plants will reseed successfully if you allow some stems to hold seed pods until they turn brown. With encouragement, wallflower will reseed for many years, often appearing in crevices or even walls.
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Troubleshooting
Provide supports for tall varieties to keep them from falling over when they become top-heavy with blooms. Snip off old blossoms to keep new flowers coming on.
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