You can use clay pebbles, sand or gravel. Link in my profile.

With just water and pebbles, water spinach grows so fast you can’t harvest it in time.

This Is What Winning Looks Like 🌱 White Bok Choy Harvest

Check comments for my Etsy store with the self watering adapters

Grow Food Fast in 2026

Best Superfood Grower, Easy DIY with Amazon Candy Tray

Upcycling deli trays to grow microgreens #diyhydroponics #reducereuserecycle

Making Growing Superfoods Easy

Upcycle everything in 2026