Putting clay pebbles on the bottoms does nothing bedside creating water retention over them; I also did that for may years but i saw a positive change when I stopped! Regular compost is usually too dense as a substrate try to mix it with some perilte to increase water drainage! Hope this was useful to you!

I recommend Sheffield made plants youtube channel, it is really enlightening!

Beautiful and deadly

Can someone explain please?

That’s a carrot, change my mind