Moorpark is quite an old variety but remains the best and most popular choice. It is quite a cold hardy tree [though still favours a good position] and it's fruits ripen late August. Flavour: good.
All varieties of Apricot are self fertile so they can be grown alone.
Apricot trees are grafted or budded onto St Julien stock. They will mature to around 300cm’s in height and spread.
If you want to grow them as fan trained against a sunny south or west wall, then you must allow not less than 6-8’ in height and width.