The triangle palm is a tropical to sub tropical tree and don’t do well below freezing.
If touched by a frost, some fronds may go yellow or brown and die.
Anything more than a light frost will damage the tree extensively and they will probably die.
These trees thrive in a sandy soil. If necessary just add a bit of sand to your soil on planting.
Make sure it is well drained, so the roots never sit in water.
They can be susceptible to a potassium deficiency. Combat by feeding properly.
Fertilize at least twice a year with a slow release granular or every 3 months with a water soluble palm fertilizer with the appropriate minerals including potassium.