Worms are good.
I rent so I get a new canvas
every few years, generally they’ve been neglected as renting is shit for a keen gardener.
One thing I recommend is manure, I do it twice a year. Once in the autumn and once in the spring, over all the beds. It suppressed the weeds, feeds and improves the soil and the worms do the digging work.
It’s miracle stuff. You need a fair amount as you need to layer it on thick.
The smell goes after a day or so, so don’t panic!!
It’s magic. Genuinely.
It’s really about the right plant in the right spot. how much sun do the beds get? The rhs plant finder is great you can pick shades, part shade or full sun. I have put a few plants in the wrong places and I now just move them, it’s surprising what a difference it makes. From something limping along to blooming. You can’t force a sun lover into a shaded spot.
New plants need a lot of water, for the first spring - summer of a shrubs life I do water it most days just to make sure it settles in.
Onto pots, are you feeding them? I do a liquid feed of seaweed once a week from spring to autumn. I water every other day, unless it’s really hot (watered last night, feeling a bit twitchy and unsure about tonight, so will poke my finger into some pots to decide).
My pot hydrangeas are not looking very good this year either. One has died. I think the past few hot summers may have made them struggle.
I too have a wall bit, it bakes in the summer and is a bog in the winter. So I’ve given up a bit on that! I may just do summer bedding and leave it at that.
Don’t give up. You’ll get there. I have and my lack of green fingers is a running family joke.