What varieties of lavender do you grow?

Naming varieties of lavender is a difficult task and there is much conflicting information. In our field, we believe we are growing two varieties of Lavandula x intermedia called ‘Pale Pretender’ and ‘Seal’. For more information take a look at History of the field or Local history.
I have lavender growing in my garden, how should I look after it?
You can find more information about growing lavender here.