This is my experience of my Honeysuckle lonicera.Every spring it puts on vigourous growth looks really well then flowers --welldisapointing,Ive tended to sort of ignore the problem because of other climbers near diong well near it.What ive managed to find out now is ,in spring the soils moist and ive tended to let the plant dry out to quick when the warmer weather arrives. So i will really mulch around it this next spring and make sure its well watered and fed.Im still not totally sure but thats my expierience.

Correct. Honeysuckle is a woodlander, needing a cool root run, from which it can launch its top up to the light and sun, so it wll often suffer where its roots are also in a dry position. Phil J