Only one of my seaberries survived. I don’t know if it’s male or female. Will it be hard to tell when the shrub blooms? I have never seen a seaberry bloom.
I don’t want to buy one of each and end up with two males and one female
Do they grow wild where you are? If so and you are lucky enough to have a female just go and grab a cutting from one now that doesn't have berries on, they root easily. No they can't self pollinate and they are not very easy to tell apart even when flowering, their flowers are pretty pathetic, I did find a paper on how to tell from the buds here that doesn't look to easy either!
Is it a named cultivar or not? Personally I wouldnt bother growing the normal version as the fruits are small almost inedible and are difficult to remove from the plant. I leave my normal ones for the birds but they dont even seem to eat many of them, so I will take them out eventually and replace them with the cultivated suckers.
If its a named cultivar it can tell you if its male or female.
Companion Planting Guide by World Permaculture Association