Here Female Seeds have a small batch of an Grapefruit inbred with Easy Sativa cannabis seeds An 80% Grapefruit selected on early and fast flowering for several generations.
This is a late maturing sativa line.
The best sowing time is mid April to mid May.
We wouldn't recommend pre-growing her indoors, because this would cause her to start flowering in May outdoors.
She needs the longer days and intensive midsummer sun to keep in growth.
Expect extreme fruity/pine taste and smell, very sativa-ish.