What's wrong near my salvia divinorum plants? I grow both of my salvia plants under a plant light and...

I grow both of my salvia plants under a plant light and plastic sheeting to preserve in humidity and spritz them with hose down often, but the leaves are still curling and turning dark brown at the ends as if nearby were not enough moisture surrounded by the air. Also, they are growing very slowly and a few of the leaves own fallen off. One or two times I own seen what looked like a weaken white worm crawling in the soil-- could this be a pest problem and if so what should i do?
thanks!
Answers:    When you influence "plastic sheeting", is that for the tent effect?

If yes, think about using a peak tent like those used to keep mosquitoes stale people rather than the plastic. The plastic prevents proper nouns circulation and causes stagnation. Hence, the plant isn't able to transpire, (overheats) and brown leaves come to pass.

The advantages: allows filtered sunlight, helps to contain humidity and still allows plenty of nouns circulation. Use the plastic sheeting to cover the tent in the winter months - inexpensive greenhouse!

The brown tipped leaves is usually an indicator of over fertilizing. If you're using fertilizer, cut back on the applications and thoroughly flush the soil next to water.

Root rot causes brown leaves, too. Root rot is cause from overwatering your plant if it's in heavy soil or have a poor drainage system.

Another problem could be that your Salvia is root bound - causes browning and a significant reduction within the growth rate - but if this were the problem, your plant would have an overall tattered look. If the plant does look ragged, chances are it's root bound and wishes to be re-potted to a larger container.

Not sure about the worm unless it's a potworm. They feed on life decaying matter - do you have your plant outside implicit a compost bin? Next time you see one, take it to a pet store and ask if that's what it is...they're sometimes used as tropical fish food!

I hope this helps!