Quercus palustris (Early defoliant form)
[optinlocker]Pin Oaks have been used in many Melbourne suburbs, forming much of the ‘backbone’ of deciduous planting. There are two significant problems with Pin Oaks:
- when young, they hold their foliage during winter
- many have poor form, with co-dominant leaders.
Metropolitan Tree Growers are now growing a form of Pin Oak that defoliates each winter, even on young trees. This clears-up the untidy appearance of young trees in the streetscape. This ‘early defoliant form’ also has excellent structure, without the major problem of co-dominant leaders.
Streetscapes where Pin Oaks have been successfully grown are among Melbourne’s most beautiful. The straight, tapered trunks give a sense of scale, and the evenly-branched, fine canopy gives the shade desired. To achieve a streetscape of this quality, the trees must be planted without power line obstruction, they must be a budded form that will not bifurcate, they should be planted at 12 to 15m spacing, and they should be irrigated fortnightly during the dry summer months.
Pin Oak can be an excellent tree for areas where soils may have a high clay fraction, where pH is below 6.0 and where sites may become wet for extended periods during winter. These are the easiest of the oaks to transplant, and they will establish quickly in the landscape. Because of their rapidly-growing root systems, we do not recommend planting Pin Oaks in restricted areas or under bitumen.
Quercus palustris ‘Pringreen’ is an upright selection of Pin Oak introduced into Australia by Fleming’s Nurseries. It will typically grow 15 m tall and 4 m wide and will have the same general environmental tolerances as the species[/optinlocker]
Typical mature height 20m
Useful in: streetscapes, avenues, parks
Sites for best growth: clay soils, moist sites