Use Osmocote instead. It's time released and is better than the spikes. In your area, the nine month release should be good.

My DIL who knows absolutely zero/zilch/nada about gardening and who never pulls weeds, never sprays, waters, etc., sticks those fertilizer sticks in her rose beds and I swear her roses do better than mine. Not sure if it is the weeds, the sticks or the lack of water, but geez, she has some of the prettiest hybrid teas I have ever seen. It is almost embarrassing to know how hard I work to get half the look she gets.

thank you both
I may just give them a try. Or I may just toss some Osmocote around the bed. The latter might be more efficient anyway.
c

Depending on how many roses you have, spikes might get very expensive. You would probably be better off just putting down some time release stuff, as mentioned.
I am experimenting this year, however. My climbers are huge. I have given each 1 or 2 tree spikes, you know, the big ones that need to be hammered in. So far, they appear very happy.
Good luck with whatever you choose.
Kathy