Seed pods are usually left on the plant until they have gone brown and the seeds have fully ripened. Then just as they are opening you can take them off.
My favourite tree is the oak at the bottom of mum and dad's garden. My sister and I used to have hours of fun climbing up it and sitting up there.
It's a good plant to put where other things struggle to grow
They need to be planted away from the wind and strong sunlight, preferably in ericaceous soil
Worms casts, and the shiny stuff is a slug or snail trail
You might have lost too much root when you dug them up, probably should have pruned them back hard so that the roots didn't have so much top growth to try and support.
I have this rose, it smells lovely, doesn't have thorns, but gets a lot of black spot
No. 2 looks like a saxifrage
Bananas give off ethylene gas which is why we use them to ripen over fruits and why they shouldn't be kept near cut flowers
https://www.rhs.org.uk/advice/profile?PID=592 Dahlia care