Brian: There is no reason why the Apache blackberry should not do well in coastal South Carolina. I don't think I would be concerned about inadequate winter chilling hours, since this blackberry is grown as far south as Florida. Hot, humid summers is just what blackberries like, so long as the soil they are planted in is not allowed to dry out completely. I know that you have had an unusual dry period in SC this season, and in these conditions you would want to water the plants deeply about once a week, especially if your soil is light and sandy. But you can help this situation by mulching the plants with whatever organic mulch you can find, to help hold moisture in the soil and feed the plants. I use stable manure that consists of about 70% wood chips and 30% horse apples, but chips or sawdust from lumber mills, compost, or even grass clippings would be fine. I grow the trailing thornless Triple Crown and Doyle here, and we are picking their big berries right now, with the season extending to about the last week of August. Apache sounds as good or better than what I am growing, although it is hard to beat Doyle for total production. We just made our first batch of blackberry jelly tonight with a mix of these two varieties, and it is pretty good stuff. You can't buy anything of this flavor and quality. If you like blackberries, put your Apaches in this fall. Don Yellman, Great Falls, VA

Water less if water every day that's to much for blackberries water every 3 days at most. In ground when dry water once a week root like some dry time before next watering.

Your post doesn't contain a lot of context to draw from in diagnosing what went wrong, but in general terms my advice would be not to transplant such an established blackberry. Blackberries are amongst the very easiest of plants to propagate and come into production relatively quickly for fruit. In order to make new plants simply let the tips of canes arch back down to the ground and make contact. From there the tips will root and you will have a cane that is rooted on both ends. Snip it closer to the tip that rooted after it is established and plant it where you like. Even better you can add a little mound of dirt or weight it down to help. Or root the tip into a pot. If untended blackberries will spread quite a bit by tiprooting on their own with no help from anybody.

Fred,I'm going to give you the link to a forum here that is exclusively about fruits. I'll bet someone there can give you all your answers pretty quickly. Good luck with your berries..I envy that you are growing them. Here is a link that might be useful: fruit forum