I dont think you can find out what type of lemon, you can buy separate citrus feeds for summer and winter,from garden centres we are using a liquid fertiliser from The Citrus Centre (Pulborough) only because we visited. They dont like being indoors, especially in winter, they need a cold snap, You could look up Monty Dons advice. My Hubby used to insist our went into our conservaotry, with the warmth, they get scale insect overwinter, because its so warm and cosy, and they give of a revolting sticky substance which covered all my furniture and floor, between us Monty and I managed to convince him they would be fine in a frostfree greenhouse. It it said they will loose their leaves if allowed to go below 10d, but they have been left out at night and forgotten occassionally, and nothing happened. They are outside now, getting a little rain. I find they dont like full summer sun (I know barmy when you hink of hot countries where they grow happily) so Hubby made some stagging which goes round the side of our bungalow in the summer and they sit there quite happily.He also helps polination by going round the flowers with a kids paint brush, and sprays the leaves with (ideally) rainwater. This helps keep the pests at bay. Dont overthink it, dont worry about getting one lot of fruit, of course, they do take a lot longer in England to produce edible size fruit than they would in southern Spain, but most people grow them for the flowers,scent. Last year I had full size lemons made my oldest son a lemon drizzle cake for his Birthday in March, happened just right! I have bought Orchids from Ikea, they are just as good as expensive ones I have bought from "specialist" Orchid growers. If you dont keep them moist, they tiy fruit drop off, very quickly, hence the spraying with water. Hope this helps.