Gravel trays help please!
Stupid newbie question! I was given some rather large gravel trays yesterday to use in my greenhouse and thought as all my seedlings are in their own biodegradable mini pots I could put them all in one and use to water all at once. Tried this morning and had a lot of standing water left around in them. What's the best way to use them please? I don't want to have to fill and remove every time I water as there's a lot of plants in there and it's more time consuming than how I was previously watering them from the top.