There's a section in Michel Pilarski's food forest
course about preserving plants and protecting them prior to planting:
http://organiclifeguru.com/course/how-to-grow-a-medicinal-food-forest/
Michael covers it in great detail in the Planting Part 1 Lesson. You can put the plants in buckets with
water and some inoculants ...
Water inoculants mentioned in this lesson:
Root Zone: Mycorrhizal fungi with beneficial bacteria
MAXSEA Soluble Seaweed Acid Plant Food
Liquinox Start Vitamin B-1