January 31, 2011
For a south facing window in a conservatory, I would suggest taking a look at Citrus trees. South facing should give them more than enough light, the conservatory should stay plenty warm and the water reservoir would keep them watered to their liking.
The benefits would be that they are lovely trees on their own (and there are many varieties bred specifically to stay under certain heights for indoor planting), they get the most lovely smelling flowers and it is possible to grow the fruit indoors with the right light (which it sounds like you have).
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