Why my Penstemon isn't Flowering?
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.