A xylopolist is someone who sells wood. Or, from Encyclo: 1. One who sells timber; a timber-merchant. 2. A dealer in wooden objects or one who sells various kinds of wood or wooden objects. I assume this includes someone who sells Christmas trees.
X is always tricky for ABC Wednesday participants. There are two common prefixes in English that start with X that folks have used quite often.
If you are seeking other words, try plants, specifically these botany entries.
Look also at common Mandarin Chinese words.
Consider this as my Christmas Hanukkah Festivus Kwanzaa present to you!