I found a gardner's web forum last night that had over forty posts on bitter raspberries. Most were from Canada, they were posted with follow ups over 4-5 years. No definitive answers, many reports of it just happening; and the berries would be fine the next year. I didn't even see a common weather or water issue; or age of the plant issue.
Some mulched with maple leaves to insure it wouldn't happen; but we don't have maples here in Alaska.
The berries were very ripe, I would have had 20% more by picking a few days early, as so many fell to the ground when the plant was touched. I have another small picking left, probably ripe in a week or so. |