It's heart breaking to put so much effort to keep the lovely original trees only to see them go *poof* after a simple <swipe/swipe> to navigate around the farm.

What about:

Settings > Adv. Settings > Lock original trees: Prevent original trees from being cut down

I would use this option now that I have opened all the land and want to keep things as they are.

I agree with the decision to not be able to purchase the original trees. It brings a level of disciple and forces thought in design. But when this goes up in smoke in a single instant, after painstakingly harvesting trees all around them, from a simple double-swipe navigation move, well - it's painful!

Thanks for an amazing game,