Squash (Winter): Sow and Grow GuideUpdated 14 days ago
Winter squash is a hardy, versatile vegetable that stores well and provides a rich, sweet harvest. Here's a concise guide to successfully sowing and growing winter squash.
When to Sow
Sow winter squash seeds outdoors after the last frost when the soil has warmed to at least 70°F. For an earlier start, seeds can be sown indoors 3-4 weeks before the last frost and transplanted once the weather is consistently warm.
Outdoor Sowing
Choose a sunny location with well-drained, fertile soil. Sow seeds 1 inch deep, spacing them 3-4 feet apart in rows spaced 5-6 feet apart, depending on the variety. Winter squash vines need plenty of room to spread. Water gently after sowing and keep the soil consistently moist until germination, which typically takes 7-14 days.
Indoor Sowing
For indoor sowing, plant seeds 1 inch deep in seed trays or small pots filled with a light, well-draining soil mix. Keep the soil moist and warm, ideally between 70-85°F. Transplant seedlings outdoors once they have two sets of true leaves and the danger of frost has passed. Handle the seedlings carefully to avoid disturbing the roots.
Care and Maintenance
Winter squash requires full sun and regular watering, particularly during flowering and fruit development. Keep the soil evenly moist but avoid waterlogging. Mulch around the plants to retain moisture and suppress weeds. Apply a balanced fertilizer when the plants start to vine and again when fruit begins to set.
Pests and Diseases
Common pests include squash bugs, cucumber beetles, and vine borers. Protect young plants with row covers and check regularly for signs of pests. Winter squash can be prone to powdery mildew and other fungal diseases, so ensure good air circulation, avoid overhead watering, and plant in well-drained soil.
Harvesting
Winter squash is ready to harvest when the skin is hard and cannot be easily pierced with a fingernail, usually in late summer to early fall. The stems should also be dry and start to crack. Use a sharp knife or pruners to cut the squash from the vine, leaving a few inches of stem attached to extend storage life. Cure the squash in a warm, dry place for 10-14 days before storing.
Garden Use
Winter squash plants are ideal for garden beds with plenty of space. They can be trained to climb trellises to save space and improve air circulation. Winter squash is also a good companion for corn and beans in a traditional "Three Sisters" planting, which helps to maximize garden productivity.
For further details, visit the full guide on the Botanical Interests Blog.