Siberian Wallflower Seeds | Orange Biennial Flowers

Siberian Wallflower seeds produce bright orange flower clusters on plants approximately 12–18 inches tall. Traditionally sold as Cheiranthus allionii, this biennial brings warm color to sunny borders and informal flower plantings. Grow a group near the front of a bed to enjoy the orange blooms alongside spring and early-summer flowers, with occasional butterfly visitors.

Choose your seed pack

• 1,000 seeds.
• 3,000 seeds.
• 7 grams.
• 1 oz.
• 1/4 lb.
• 1 lb.

One cart quantity purchases one selected pack. Weight-based options are sold by weight, not an exact seed count. The existing estimate is approximately 22,000 seeds per ounce, with variation between lots. All options are for orange-flowering Siberian Wallflower, not a color mix. This listing is for seeds to plant, not live plants.

Plant details

• Botanical name: sold as Cheiranthus allionii, also known as Erysimum × allionii.
• Life cycle: usually grown as a biennial; plants may persist as short-lived perennials in suitable conditions.
• Height: approximately 12–18 inches.
• Flowers: vivid orange blooms in clusters.
• Bloom period: generally spring to early summer, depending on climate and sowing date.
• Light: full sun.
• Soil: sandy or loamy, well-drained soil; approximately pH 6.1–7.3.
• Spacing: approximately 9–12 inches between plants.

Understanding the biennial cycle

Plan for plants to establish foliage before their main flowering season, often blooming after an overwintering period. First-year flowers are not guaranteed. Persistence and winter survival depend on local conditions, and the name “Siberian” is not a promise of survival in every cold climate.

The existing USDA zone guide is 3–9. Use local planting guidance and consider winter drainage as well as minimum temperatures. Avoid expecting the same planting calendar or flowering period in every region.

When to sow

Sow in spring or late summer to early fall when temperatures favor establishment. In autumn, allow enough time for young plants to establish before severe cold. In hot climates, favor the cooler growing season rather than sowing into intense summer heat.

Sowing and germination

Prepare a fine, weed-free seedbed and press seeds gently onto the moist surface. Cover only very lightly with fine soil, no deeper than approximately 1/8 inch. Avoid deep burial, as light supports germination.

Aim for approximately 65–75°F. Keep the seedbed consistently moist but not waterlogged. Germination commonly takes 15–30 days, depending on conditions. Water gently to prevent small seeds from washing away.

Thin seedlings to approximately 9–12 inches apart. If starting in trays, provide bright light after emergence and gradually acclimate seedlings to outdoor conditions before transplanting at their original growing depth.

For larger areas, the existing sowing guidance is approximately 3 ounces per 1,000 square feet or 8 pounds per acre. These are approximate rates for different planting scales, not exact equivalents; preparation and desired density affect the amount required.

Watering and routine care

Water regularly during establishment, then adjust to rainfall and soil moisture. Allow excess water to drain, avoiding saturated soil around the crown. Keep competing weeds down while plants are small.

Feed according to soil needs and fertilizer label directions rather than routinely applying heavy nitrogen. Remove faded flower stems for a tidier display. If you leave seed heads to mature, some self-sowing may occur; remove unwanted seedlings.

Deer may leave wallflowers alone in some gardens, but browsing varies and no plant is deer-proof. Monitor for pests and damaged foliage rather than relying on resistance claims.

Container growing

Choose a container with drainage holes and fresh, well-drained potting mix. Leave room for mature plants and place in full sun. Check moisture regularly, since containers dry faster than garden beds, but do not leave pots standing in water.

Container roots are more exposed to winter temperatures than roots in the ground. Provide locally appropriate protection if keeping plants through winter for the following flowering season.

Flowers for indoor use

Cut a few stems when flowers are opening, using clean snips. Remove leaves that would sit below the waterline and place stems promptly into clean water. For dried floral crafts or potpourri, dry small bunches in a shaded, well-ventilated place; color retention varies. Flowers have also been used for dye crafts, but dye results and colorfastness are not guaranteed.

Handling and seed storage

Grow for ornamental use, not food. Keep seeds and plant material away from children and pets, and wash hands after gardening. Store unused seeds sealed in a cool, dry, dark place away from heat and moisture.