Hey Starwatcher....not sure about the specifics for razzleberries....@ folks the pH is high...so I guess since I really never saw any severe issues there I would belay to that and what I have seen in the woods....pH @ folks is/was in the high 7's....up there I would think that you should be below 7...and in the woods I most commonly see them associated with deciduous hardwoods and that reinforces my feelings regarding a sweeter(higher pH) soil.....the most important thing that I recall in regard to the raspberries is that one should avoid dryness at fruit set and there after...during production times-a thick later on compost/leaf mold would be of assistant and putting the fertilizer under this compost would lock the phosphates down where they need to be, and pruning them properly.....and burying the summer canes over winter to get good production on the first fruit set....but I grew up with day length specific berries not day neutral like Heritage is.....fertilize w/ 10-10-10...5/10/5... they are heavy feeders. the varieties that I grew up with were Latham and September Red. The pH can be dropped with lime, gypsum(pellitized), and maple/birch compost...mom made this wonderous raspberry sauce with the fall berries(they are much bigger and taster IMHO)-process is similar to processing tomatoes in glass mason jars.....it was holiday fare on homemade vanilla ice cream or frozen custard....very good stuff and I cant forget the raspberry red currant jelly...MMMMMMMM YUM ;)