Feeding Clematis

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I have a question about using the granular feed that we ordered along with our four plants. Can you tell me how much to use per plant and how often. Do I use this in addition to tomato food or instead of?
Thank you.

Hi Maggie, half a packet per plant, just on the surface after planting and this is just once a year.
then we liquid feed tomato food (or any other high potash feed) weekly from now until august time
cheers chris

Chris and Suzy