Raspberries not flowering this year
Jefferson County Colorado
Thank you for your question. The flowering could be delayed due to our cool, wet spring, along with the two major freeze events. Let me ask a few questions to see if we can rule out other causes.
- Tell me about how you are watering: frequency, method, amount.
- Tell me about how you have fertilized....any change from past years that you indicated above?
- Any change in your pruning methods in the past year?
- You say they have good vegetative growth - does it look the same as in past years (eg, any stunting, deformity, color patterns)?
- Would you send me photos of the plants?
Mari asked me to do some additional research on your question. After looking at your answers to Mari's questions and checking them against CSU information sheets, it appears you are doing everything right. Patti, another volunteer clinician with extensive experience growing raspberries including Heritage confirmed that your plants should be flowering and setting fruit about now.
After researching viruses and possible environment effects, all I could come up with was the possibility of excess Nitrogen which can cause plants to produce lush vegetative growth but not flower or fruit. Mari and I would suggest a basic soils test and possibly a test of your compost and/ or a tissue sample. Here is
the link to the CSU Soil, Water and Plant Testing Laboratory
Feel free to contact us if you have further questions