How to Sow Mixed English Wallflower Seeds in the UK 

Mixed English Wallflowers are a classic garden favourite, known for their vibrant array of purple, yellow, red, and white blooms. With lush green stems and compact fragrant flowers, they bring charm and colour to cooler seasons. Part of the mustard family, wallflowers thrive as bedding plants and are perennials in areas with mild winters. Reaching heights of 18-20 inches when fully grown, they also exude a soft, sweet fragrance, making them a perfect addition to borders, containers, and window boxes. 

When to Sow Mixed English Wallflower Seeds 

• Indoor Sowing: Start seeds indoors from early spring (February to April) for blooms the following year.
• Outdoor Sowing: Sow directly outdoors in late spring or summer (May to July) once the soil has warmed and frosts have passed. 

Step-by-Step Guide to Sowing Mixed English Wallflower Seeds 

Indoor Sowing 

1. Prepare Containers: Fill seed trays or small pots with fine, moist compost. Ensure the compost is well-drained and free from clumps. 
2. Planting Depth: Sow seeds at a depth of 1/4 inch (6 mm) and lightly cover with compost. 
3. Optimal Conditions: Place containers in a well-lit area with temperatures maintained at or above 20°C (68°F). 
4. Watering: Keep the compost moist but not waterlogged throughout germination, which typically occurs within 7-21 days. 
5. Transplanting: Once seedlings are over 3 inches tall and have their first true leaves, transplant them into individual pots or directly into their final growing location. 

Outdoor Sowing 

1. Prepare the Soil: Select a sunny location with well-drained soil. Avoid acidic soils, as these can lead to club root issues. Loosen the soil with a fork and remove weeds. 
2. Sowing the Seeds: Sow seeds directly into the soil at a depth of 1/4 inch, spacing them evenly. 
3. Watering: Water lightly after sowing and keep the soil consistently moist until germination occurs. 
4. Thinning: Once seedlings appear, thin them to a spacing of 12 inches apart to allow for proper air circulation and growth. 

Caring for Mixed English Wallflower Plants 

• Watering: Keep the soil moist, particularly during dry spells in hotter months. Avoid overwatering, as wallflowers prefer well-drained conditions. 
• Weeding: Remove weeds regularly to reduce competition for nutrients and water. 
• Sunlight: Plant in a location that receives full sun for the best blooms. 
• Feeding: Mixed English Wallflowers generally do not require heavy feeding. Adding a balanced fertiliser during early growth can support robust flowering. 
• Pruning: Prune plants back heavily before winter to encourage new growth. Though they may look untidy in colder months, they will rejuvenate in spring. 

Common Questions About Growing Mixed English Wallflower Seeds 

• Can wallflowers be grown in containers? Yes, they thrive in containers, window boxes, and pots. Ensure good drainage and use quality compost. 

• Do wallflowers need full sun? Wallflowers grow best in full sun but can tolerate partial shade. Full sun produces more vibrant flowers. 

• How do I extend the life of my wallflowers? Regular pruning and removing spent flowers can prolong their lifespan. In mild winters, they can act as short-lived perennials. 

• What soil is best for wallflowers? Well-drained soil with a neutral to slightly alkaline pH is ideal. Avoid acidic soils to prevent club root. 

By following these steps, you can enjoy a stunning display of Mixed English Wallflowers in your garden. Their vibrant blooms and delightful fragrance make them a favourite for UK gardeners, perfect for adding a burst of colour to borders, containers, or rockeries. With proper care, these hardy plants will reward you with beautiful flowers year after year. 

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