Hi, I did post this earlier but in another thread, probably not the right one - apologies. Here goes:

I'm in London, UK. My calamondin and lemon were given to us in May and prospered wonderfully all summer, there's a lemon growing and the calamondin has given two crops of fruit which made small but divine pots of marmelade. They are about three feet tall (the lemon is bigger) and in 9inch pots.

Now they are indoors in the dining room, which is the coolest place in the house. They are beside the french doors and the ambient temperature is between 15 - 17 degrees Celsius (60 - 63F). It faces east and is quite light but there isn't that much light here in midwinter. I have some 'Citrus Food' labelled for Winter and have been watering the plants once every ten days or so, as more than that and I think they'll get too wet. The lemon still looks OK, some leaves a bit curled and one small lemonling fell off but the main one seems OK, just not growing any bigger. But the orange tree is looking very pale and some leaves have dropped off. There are a number of fruits on the tree, some have dropped off but that may be self-thinning, and a few are beginning to colour up.

How do I keep all their mineral etc needs fulfilled while not watering too much? I do worry about the orange tree, which I think may have got very wet in the last week or so before I brought it in a couple of months ago.