ABSTRACT

Warm callusing using conventional poly-tents is usual but occasionally supported warm callusing using overhead mist is favoured. Open mist set to give water bursts at intervals of lengthy duration may reduce prolonged wet foliage conditions, and assist in controlling foliar diseases, to which Junipers are particularly susceptible. Replacing polythene film with horticultural fleece for covering Cupressus, vulnerable to foliar diseases, may prove equally successful for Junipers. Given good drainage and open-air conditions, Junipers grow well in containers or in the field. In the Netherlands grafting is generally delayed until February/ March/April. The seed-raised Juniperus virginiana is an alternative and was for some years the major rootstock species; however, its susceptibility to Juniper blight has resulted in a general move away in favour of the more resistant J. x pfitzeriana ‘Hetzii’, which is said by Dutch grafters also to be more resistant to Aphid attack.