Posted: 22/07/2016 at 18:26
Not wishing to be rude but the lady in Wyevale has probably never grown a Citrus in her life.
The Citrus they sell are grown in conditions that the average gardener here is unlikely to be able to emulate......compact because it forces the tree to produce flowers and fruit and therefore sells well. If you think about most growing things, their ultimate aim is to reproduce. Keep them restricted and what do they think ? Best get on and reproduce then.
Having said that, there are a number of cultivars available for sale these days but like so many fruit trees described as "Patio" or "Dwarf", you really need to check out the rootstock. They rarely perform as promised.
If you are planning to grow the Citrus outside all year round ( they don't really make good house plants - the atmosphere is usually far too dry for them ), you would deal with them much as the same as any other tree.......pot on every year and use a good soil based compost - JI 3 as an eg.. Frost protection is necessary.
Having had Citrus trees in Spain and France and then growing them in the UK, I can safely say that it is unlikely you will benefit from much of an edible crop here. However, they will flower and attempt to produce fruit - the scent from the flowers alone are quite often worth the effort.
Buying them from a garden centre when they already have fruit on them is fine.......it's trying to get them to perform again the following year .......the Garden Centres don't tell you too much about that
Does that hep at all ? Despite my rather grumpy comments above, I do like Citrus so hope yours will do well for you.