Hi Biosman. Thanks for your question and sorry I could not respond sooner. Been incredibly busy. The purple trees you see in the simulator represent purple hue trees such as lilac bushes and jacaranda trees like the ones below:
These purple trees and bushes are visible in many parts of the world during spring. For instance:
Mexico City
San Diego
Sydney
Cape Coral Florida
Naples Florida
And other parts
In addition to vegetation that has purple hues, AccuSeason also displays lighter colored white, off white, and pink-ish colored vegetation in the mix. Here are some shots I just took in Florida. The first is around Tampa and the second and third are in Orlando:
Being that we build AccuSeason to offer users with a lot of choice, if you are wanting to not have floral vegetation display, you can use any of the four Spring presets which include Celtic Spring, Morning Dew, Serenity, or Spring Has Sprung. Those presets do not contain floral vegetation.
Let me know if this helps and answers your questions. Thanks.