We're offering you a 24 Cell Windowsill Green House Kit for £4.99, saving you up to 38% off Thompson and Morgan's's price of £7.99 (correct as of 10.02.2026).

Start Your Garden Indoors with Ease

The 24 Cell Compact Windowsill Greenhouse Kit is designed for gardeners who want to grow healthy seedlings, herbs, or flowers indoors. With its streamlined design, this kit fits perfectly on most windowsills—giving you the freedom to nurture a wide variety of plants in even the smallest spaces.

Why Choose This Kit?

• Nurture Strong Roots: Each of the 24 biodegradable coir cells supports robust root development and can be planted directly into soil outdoors—minimising transplant shock.
• Create the Ideal Environment: The clear humidity lid helps retain warmth and moisture, accelerating germination and giving your seedlings the best possible start.
• No More Mess: The included drip tray collects excess water, keeping your windowsill clean and tidy.
• Sow a Variety: Perfect for larger seeds like pumpkins, tomatoes, sunflowers, calendula, marigolds, and more. Also suitable for cuttings and smaller seeds.
• Sustainable & Simple: Coir trays are biodegradable and eco-friendly—no plastic waste or complicated setup required.

Your Growing Guide

• Sowing Time: Start seeds indoors from late winter through early spring for an early harvest. For herbs or microgreens, sow year-round.
• Light Requirements: Place in a bright spot with indirect sunlight—most seedlings thrive with at least 6 hours of light per day.
• Watering: Keep coir cells moist but not waterlogged. The drip tray will help manage excess moisture.
• Caring for Seedlings: Once seedlings have several true leaves and all risk of frost has passed, plant them outdoors directly in their coir cells to minimise root disturbance.
• Soil Preferences: Most flowers, herbs, and vegetables thrive in well-draining compost or potting mix with neutral pH (6.0–7.0).

Irrigation & Maintenance Tips

• Mist seedlings regularly to maintain humidity under the lid.
• Avoid overwatering; empty the drip tray as needed.
• If growing under low light conditions, consider supplemental grow lights.

FAQs

• When is the best time to start seeds in this kit?
  The ideal time is late winter through early spring. For herbs or microgreens, you can sow seeds year-round indoors.
• What plants work best in these trays?
  This kit suits most annuals and vegetables—especially larger seeds like tomatoes, sunflowers, pumpkins, marigolds, and many herbs.
• How do I transplant seedlings outdoors?
  Once seedlings are sturdy and frosts have passed, plant them outside directly in their coir cells. The coir will break down naturally in the soil.