You certainly can sprinkle the coffee grounds on the ground around the roses and work it in a little bit. It is a great soils amendment and the gladiolas will love them too. I would not cover the new little bulbs with coffee grounds though as direct contact might cause some tissue burn. Cover those with some nice potting type soil and water lightly. Here are some links to articles on this subject for you:
Answered on October 19, 2012
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