Wiltshire,
United Kingdom 
When Should penstemons be pruned back
On plant
Penstemon digitalis
7 Mar, 2010
Answers
I reckon to do mine in the spring too but as SK says, wait until it has warmed up a bit and the forecast is for a warmer spell
7 Mar, 2010
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Previous question
i cut mine back in spring, but am leaving it a bit later this year due to the cold, give it another week or two
7 Mar, 2010