This is our first year growing ashwagandha. We have a shrub that is low-lying and about 3' in diameter. We're hesitant to try to dig up any roots this year, and were wondering if it would be best to just leave all the berries on it and let them seed and spread out so we will have some roots to harvest next year. Will the plant need any additional help from us, or will it just seed itself naturally? (We're in Zone 6, SE Pennsylavania.) Also is it worth harvesting some of the berries, and if so, what is the best way to use them?