What do you recommend for isolating RNA from more than 100 mg of plant tissue?
FAQ ID -570

You can use the RNeasy Midi Kit for up to 500 mg of plant tissue, and the RNeasy Maxi Kit for up to 1 g of plant material. Please follow the guidelines in Appendix D of the RNeasy Midi/Maxi Handbook. The samples will require rotor-stator homogenization, since QIAshredders are not available for the RNeasy Midi/Maxi format.