Why my Penstemon isn't Flowering?
in Plants
It has grown with lush foilage at up to 4' tall but no flower buds. It appears that I may have too rich a soil for it (as discussed with a recent issue with another plant query on here). I think it's a 'Burgundy' and has been growing in my flower bed for at least 5 years. I did have 'Sour Grapes' flowering earlier in the season so I'm a bit confused why the 'Burgundy' hasn't flowered. It has thrived a great deal compared to last year's growth.
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Do you chop them back in Spring?
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
OP - I wonder if cutting them back in autumn is a bit early and maki g them put out more vegetative growth instead of flowering? Just a thought.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.