I have created numerous trees but I cannot find them.
How to retrieve an array of all the trees?
Using Solana web3 js
Helius has a transaction history API.
https://docs.helius.dev/solana-apis/enhanced-transactions-api/parsed-transaction-history
You can run it on your wallet. It will be a little tricky to extract which tree creations but it is doable.
Alternatively perhaps you could run a GPA on the bubblegum program and filter for tree config accounts.
Where you are the tree creator. If you used Bubblegum.