Not to forget TreePro from Onyx. Look there. By the way, for all flower lovers out there, Onyx has a flower module. Looms fantastic! Ok, is not the cheapest in the world i would say, but the results look very promising. Back to the originla question here. No, not possible to start from scratch with new plants, you need to modify an existing one. But the variety is big, so you probably will find a base for what you plan.

One day your ship comes in - but you're at the airport.