I've never tried to figure that out, whenever I tried, Mother Nature changed my figures. I plan on having enough baskets for 1 qt per plant of strawberries. I don't grow blueberries, and my blackberries are wild so I have no idea how many plants I have.

Marla

Bob, there are a myriad of factors when determining numbers of berries per plant. Most nurseries offer an estimate per variety. Like Marla said, nature has the ultimate say on what they'll do. I like to hedge my bets by planting a wide variety so that if one fails the others might not. I also plant mine according to when they ripen. I harvest blueberries from June until the end of Sept/Oct. You can time your harvest of other berries as well. I have one row of everbearing red raspberries and one row of summer bearing--again to spread out the harvest. Some folks want a crop all at once. I have so much to do already that I plant only June bearing strawberries. Some day, I may do both. Certain blueberries may get 7 feet tall and produce 20 lbs of berries while others top out at 4 ft and 10 lbs of berries. The same is true of the blackberry cultivars--altho' they're pretty prolific regardless. I know this really didn't answer your question, but there is really no definitive answer. Still, these are considerations you'll face.

Brook