Mannerlein’s grounds at summer cottage - pinus sylvestris

Vanajan - Pinus sylvestris seed tree method

Niels Kreiberg standing next to 5 yr Populus tremula × Populus tremuloides in Haapastensyrja

Haapastensyrja - Plastic house where cuttings are rooted

A photo of a production nursery - general view

Haapastensyrja - view of beds after plastic house removed

Rooted cuttings of PIa in heated peat at Haapastensyrja

Detail of venting of the plastic house in Haapastensyrja

PIa sown May/70 in plastic house at Haapastensyrja

PIa was sown May 9/70 in peat which later will be lifted and
stored at -5 C in fall (Sept./70). Initially planted in a temporary plastic house in Haapastensyrja.