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.