@Bluechick2u- Sorry to hear about that. Sounds like you selected proper varieties. I haven't had any outright casualties, though some plants have taken off faster than others. Not sure what your specific problem is and it sounds like you have plenty of experience. Just throwing out ideas, so please don't be insulted as they are basic:
- I believe Oregon has plenty of rain. Possibly over-watering?
- I know chicken poo is considered too "hot" to use raw and should be composted before being used for fertilizer. Is that possibly true for alpaca poo?
- It is best to plant trees when they are dormant- late fall or early spring. That reduces shock.
- If working with a containerized tree and the roots are overgrown/encircling, then I'll knock off the dirt and spread out the roots as much as possible before planting. Sometimes, you have to cut some of the roots if it is bad enough.
- When planting, do not cover the root flare (bulge at the bottom of the trunk).
- Do not pile mulch against the trunk. I can't believe how many violate this rule. It holds moisture against the bark and can cause it to rot.
Here is a very good
set of instructions from the Arbor Day Foundation on planting. Good luck and hope it works better on your next attempt.