Rot caused by wet weather 2. Top up antislug to see if new shoots Delphinium has started but will not grow quickly. Soil Mixture too weak 2. Lack of water 1. Try nitrogen additive.
Delphinium has no florets or they are full of holes.
Delphinium has caterpillar tracks which are not good for delphiniums. 1. remove caterpillars. Delphinium is flat. Spikes need propping up. Florets pinking or bleaching.