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You can propagate by seed but grafting onto seedlings is necessary to maintain good characteristics in cultivars.
'Blaue Hexe': low growing, beautiful specimen with silvery blue foliage, a shrubby plant 20cm high with a 60cm spread after 10 years
'Glauca': bright blue foliage and large blue cones turning silver/brown with age - tree 20m by 8m.
'Glauca prostrata': prostrate form of the above.
'La Graciosa': Weeping/mounding variety growing to 75cm with a 1.5m spread
'Sherwoodii': Typical Christmas tree shape with bright yellow/green foliage and to 20m tall.
Giant Pine Scale - can be distinguished through the white cotton-like excretion often associated with black sooty mould created by growing on the honey dew left by insects feeding on the scale; adult scales grow to about 12mm long and mainly infect the lower branches but have also been observed in the canopy and on the roots systems.
Other pests include: aphids, bark beetles conifer twig weevils, foliage feeding caterpillars and sawflies.
Also prone to the fungal disease - canker and root and crown rots.
Book: ‘Growing Conifers’ by John Mason is available through http://www.acsgarden.com/shop/ Courses on Conifers and Landscape Design are available through Australian Correspondence Schools, see http://www.acs.edu.au/hort
Ebook - Classification, care, propagation, containers, pruning, hedges, topiary landscaping, commercial uses, conifer directory.