Junipers can be grown from Juniper berry seeds or from cuttings, although growing from seed is fairly laborious and takes time, reports Floridata's page on Juniperus squamata. To grow them from seed, first extract them from the cone and use a process called stratification to simulate dormancy.

How long does it take to grow juniper berries?

The berries are green when young, and mature to a purple-black colour over about 18 months in most species, including J. communis (shorter, 8–10 months in a few species, and about 24 months in J. drupacea).

Where can you grow juniper berries?

It will grow at high altitudes and as far north as Alaska, throughout Europe and into Asia. There are many subspecies and cultivars, with some being more inclined to be prostrate and others upright.