Here in my Z:5 garden, these are reliable reblooming diploids. I feed them Alfalfa pellets and meal along with milorganite, compost, worm castings (on some) and top dress with mulch to reduce moisture loss, thus reduce watering frequency. I sometimes add other stuff to the feeding menu like Osmocote. Last season I used some Spray And Grow sparingly. I still have most of it left over for this season. I have used fish emulsion in the past also. There is no limit to what you can try and use for your garden. When I started the new beds I used the mycorrizae (spelling ?) Fungi. My list :
Stella's Ruffled Fingers
Stella's Pink Pretty
Stella's Sparky
Rosy Returns
Apricot Sparkles
Endless Heart
On And On
Bitsy
Blackeyed Stella
Happy Returns
Centerton One
Going Bananas
Yellow Lollipop
Sunset Returns
Vineland L'uva
I am sure that there is more but these are definitely the ones I can recall right now.
For bud building hands down one of the best if not the best, the late blooming Genesta which have put out over 140 buds in my garden. I believe a picture of the scapes are in the ATP database. Only the frost stops her from going further with more buds protruding at frost kill.
