Why Raspberries Won’t Form
Sometimes it takes a bit of detective work to figure out why there’s no fruit on raspberry plants. But before you don your detective’s hat, let’s first consider how raspberries grow. The root of the raspberry plant is a perennial which sends up new canes each year. The individual canes act like a biennial, with each cane living for 2 years before dying. Everbearing raspberry canes produce berries twice in their lifetime — once in the fall of their first year and again in the summer of their second year. The fall berries are born on the tips of the cane, while the next summer’s berries emerge further down the stalk. After bearing fruit in the fall, the spent cane tips die back. This dead material at the very end of the cane can be safely pruned. Summer-bearing raspberries don’t produce fruit their first year. If the tip of the cane is pruned in the fall, there will be no fruit on raspberry plants the following year. It’s essential to know which type of raspberry plants you are cultivating and prune accordingly. To complicate matters, each raspberry plant will have both first and second year canes coming from the same root stock. To make harvesting berries easier and to reduce disease, second year canes should be pruned to the ground after fruiting. Inadvertently pruning first-year canes could also be the reason why your raspberry plants aren’t producing.
Alternative Reasons Raspberry Plants Aren’t Producing
Improper pruning is a common reason for having no fruit on raspberry plants, but other issues can also be the problem. Plants which fail to reach full size or produce fruit can be caused by improper growing conditions, pests or disease. Raspberries grow best in raised beds full of rich, fertile soil. They require a minimum of 6 hours of direct sunlight per day and 1 inch (2.5 cm) of rain per week. If you’re fulfilling these needs and pruning correctly, yet still find the raspberry plants aren’t producing, then it’s time to look for clues which indicate these common raspberry pests or diseases:
Anthracnose – fungus (Elsinoe veneta)Cane blight (Leptosphaeria coniothyrium)Crumble-berry viruses – caused by tomato ringspot virus, raspberry bushy dwarf virus or raspberry leaf curl virusGrey Mold – fungus (Botrytis cinerea)Raspberry Caneborer – (Oberea perspicillata)Raspberry crown borer – (Pennisetia marginata)Spider mites Spur blight – fungus (Didymella applanata)
With a little perseverance, you can solve the mystery and understand why your raspberry plants aren’t producing. Since you’ve worked so hard in the garden this summer we want to show off the fruits (and veggies) of your labor! We invite you to join the Gardening Know How Virtual Harvest Show by submitting photos of your harvest!
