Scotkat, I usually feed my heuch's 5-5-5 plus they get some mushroom soil and compost tea.
Now with them growing in containers, that probably wouldn't be enough. I'd use a 10-10-10 and do it at least monthly during the growing season. They would probably enjoy some fish emulsion too. i try to be an organic gardener, so i don't use hardly anything synthetic.
Another thing that I do when planting new plants is to always mix some Alfalfa meal and some kelp into the soil. This really gives the plants a boost in their first year. Afterwards, they get both of those things mixed in with my compost tea.
You live in a world of wonderful gardens, I'm sure that there are many good plant foods available over there. They might not have the same names as the ones sold here.
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