Answer: I hate to be the one to say this, but the roses may simply be once blooming roses with a show once a year in the spring/early summer, many of the older climbers are just that. It sounds like they are healthy so you may not want to change anything. Rather than spikes I personally prefer to use a top dressing of good quality compost each spring plus a general purpose granular or slow release fertilizer of 10-10-10 or similar proportions per the label instructions. I combine that with a year round layer of organic mulch which rots down and slowly feeds the soil on an ongoing basis. Watering deeply in dry spells also helps keep them healthy. Pruning -- as you saw -- can help keep the canes vigorous with ample side shoots or laterals that will bud heavily. I'm sorry I can't be more encouraging.
Q&A Library Searching Tips