Do I need a lid?
Yup! Put a lid on it.
Your Oya came with a green silicone lid. We advise that you use the lid to help keep evaporation in and critters out (we’ve heard all sorts of ugly critter stories). It’s silicone so it can withstand the rigours of the garden—beating sun, wet/dry conditions, etc.—and it’s bright so it won’t get lost among the lush garden you’re Oyas are growing.
If you don’t like the green lid we promise not to take offence. I guess it’s not for everyone. There are definitely alternative ways to cover your Oyas. We’ve seen all kinds of creative lids used—flat rocks, garden gnomes, toy trucks… You choose what type best fits your garden.