Posted: 09/09/2014 at 15:17
This is only the second time I have tried dahlias. The first time, the tubers were very scrawny and rotted away to nothing very quickly. What would be a good feeding regime to ensure good sized tubers go into winter store? I have 3 dark-leaved plants from the 'Happy' series and have been feeding weekly with liquid tomato food, plus a monthly boost of liquid seaweed/iron.
Also, I still see comparatively recent articles recommending the use of sulphur-based products to stop the tubers from rotting while in store, but it seems that most have been banned for garden use. Is there any alternative?