I've been growing Dahlias in 15 inch tubs in a fairly rich compost with
lots of watering and liquid feed (Tomorite) every 2 weeks. Last year,
everything great. This year, lots of leaves but very few, small
flowers. What went wrong? Should I discard the tubers and start again
with fresh next year?

Mike.
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Mike Edwardes Tropicals
http://mike-edwardes.members.beeb.net