The National Trust’s Sky Gardening Challenge 2026 is all about making the most of small outdoor spaces – windowsills, balconies and patios – and they are giving away free seeds and a balcony gardening guide to help you get started.

Sign up online, choose your growing challenge and a free seed pack will be sent to your door, delivered free of charge. No garden needed – just a sunny windowsill and a bit of enthusiasm.

It is a lovely way to grow something beautiful while supporting the National Trust’s work to open up nature to everyone.