Gave roses a feed of 5-5-10 granular (broadcast as granules on the surface) last week, about 20 mls per plant (2/3 oz (half a handful). It will need watering-in soon if it doesn't rain, although there is not much danger of scorching the roots as the plants are old enough to have deep roots. The feed is quite safe on the surface. The problem would arise if we got just a small amount of rain, producing a very strong solution of feed. If this happened, I would give water.
But having said this, it is important the plants do not become dry whilst flowers are forming. This is the time of maximum water requirement. So might give each plant about a 4.5 litres (1 gallon) of tap water, whether it rains or not.
The plants would then be set up with feed and water to supply the second flush of flowers (Yes, I know that we haven't yet had the first flush, but it is important to think ahead: quality growth is a slow process).
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