It takes a long time to grow peyote. It is about 3 years to maturity. In order to get the high you want you will have to ingest 5 g of dried peyote to get the 300mg to 500mg of mescaline.
Shamanic Extracts - Peyote seeds
Erowid Peyote Vault: Basics
Peyote - Wikipedia, the free encyclopedia