i got some pineberrys this year ,iv got them in the greenhouse but somthink just not right. iv got Flowers and runners on them but no pineberry,, has any grown them befor..
Well...you need to wait for while longer..
First comes flowers...then they get pollinated...flowers start swelling up from the middle and that will be your berry.. ;)
If this is their first year...I would cut all the runners off and let the plants get bigger and better. Otherwise they spend energy for producing new off spring rather than strengthening the 'mother plants'. Strong plants are able to carry better crop in future.. ;)
and make sure theres a window left open for bees etc to come in and pollinate them for you