use Azitrol, it can be gotten at grow shops or online, and it is a super concentrated version of neem oil. Spider mites have become immune to most organic solutions around here except azitrol it seems. I have completely beaten bad infestations with it, but it takes dilligance. I would apply in every 3 then 4 day cycles, like every Thurs. and Sun. for example. Be sure to add 1-3 drops of Dr. brenners pepermint castile soap per qt. for leaf adheision, and spray under and on top of every leaf every time. They say azitrol or neem can be used up untill 3 days before harvest, but if i are dilligent now, you won't have to, if you aren't, you will smoke bugs..... I would however keep spraying in that rotation for at least 30 days after u see the last signs of them, i.e. white dots on new leaf growth with lil black or red moving dots on the back of those leaves, leaves that are "stripling" with yellow from outside edges inward, or any webbing at all anywhere. p.s. I have been mite free now for over 2 years, and only use azitrol now as a preventative / foiler feed.