Hi Cath,

Any chance you could post some pictures? The one with the red new growth sounds like it is probably fine. The one with white leaves may be iron chlorosis or a virus or something. A picture would help with diagnosing the problems.

Gilli

You say you switched to Osmocote two months ago. Have you had very hot weather since you applied it?

In my experience, Osmocote dissolves rather quickly in hot weather, releasing more fertilizer than expected, and some of the changes you see could be due to that.

As gilli said, a photo would help us figure out what could be wrong with plant #2.

Tell us how you water them, amount and how often. Is the potting material dry, wet or moist? And tell us about the containers (material, size, drainage, are you using one of those saucers under the pot) and the type of potting mix you used.

Osmocote is not appropriate for roses in containers; it releases too much nutrient too quickly and can destroy the root system. This could be a big part of the problem. So, when you water, water enough that it flows freely out the bottom for a minute or so, and stop using Osmocote.