Trichs can be seen on some plants even in vegetative state.

Generally, as soon as the plant starts producing terpene (which gives herb its smell) it will also begin to produce some trichs.

Remember,,,it isnt the trichs that get us high...its the resin in them.

First come the trics, then comes the resin.

Resin is still produced, albeit at a very low rate, even in veg state.

Thats why you can get stoned off your veg state foilage