Tree ponies are completely open and you can use any traits you need.
I'll still be looking over some things, and your tree pony also needs to be added to the Masterlist so I know who has one of them.
You need to list every trait you used.
And that is basically it.
Also some info;
Home + Habitat: Their usual habitat is a forest or a small village, they rarely live in busy cities due to their quiet nature. Food: They eat the same food as anypony.
General Behavior: They have a calm and rassional personality and they are quite happy most of the time. Mating: They can mate with other ponies, but it's a harder process if it's not another tree pony.
Extra Info: Their petals scatter like real trees, but their trees growth process is faster than normal trees. Their hair is usually made out of flower petals, they can be leaves too, not as often though.
Common Traits: Mane made out of petals/or leaves, Unicorn, Warm colours, living for 150 years
Uncommon Traits: - Colder Colours, real hair, body markings, bare hooves, ability to control others by voice, life of 500 years
Rare Traits: Sap that can heal, a made up tree/a breed of two trees, leaves made up of gems/royal material/crystals, different coloured eyes, branch horns
Legendary Traits: Alicorn, infinite life, Vines on body, flowers growing on back, mane and tree leaves light up when sad or concerned
Never Traits: - Over 10 colours on the pony (accessories don't count), having a cutie mark,
Always traits: Tree tail, Mane made out of leaves/petals