In regards to this article on your website: https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/soaking-seeds.htm I'm Just curious if this method would be suitable for all types of seeds, including those that require cold stratification for months, or even winterising (freezer)? Some of the berry seeds, like aronia, are extremely small, and require 3 months cold stratification. I wonder if the heat wouldn\'t damage the seeds? Wondering if this has been tested. If it does work, why does anyone bother with stratification? Also, how long would it take for these cold climate seeds to germinate using this method? Thanks!
You could do this after cold stratification to aid in germination.
This stratification process will help break the extreme dormancy that this seed experiences, and will take anywhere from 90 to 120 days. Germination takes around 10 to 20 days after stratification. Using the method you mentioned will likely speed that process up.
I ordered some 2-3 year old chokeberry bushes, only now I see that they ship in november. I live in northern Maine, and the ground may be frozen by then. Should I container them over winter? How would I go about making sure they survive?
Yes, you will want to leave them in container. Though they are VERY cold hardy, they will appreciate an early spring planting. If you don't have a horticultural lamp, you can keep them alive (but likely not the happiest) indoors using natural window light, given you can find a well lit spot.
This article will give you a little information on Aronia- https://www.gardeningknowhow.com/ornamental/trees/chokecherry/chokecherries-in-the-landscape.htm