![]() Pests and diseasesĭouglas-fir is relatively healthy in cooler regions. They should be controlled with poison, trapping or shooting. Possums continue to debark and debud trees until they are at least 10 years old. They will slice off trees near ground level at a 45 degree angle, killing them. ![]() Young Douglas fir seedlings are palatable to hares and rabbits. Stock should be fenced out for at least eight years or until rough bark develops. See Successful establishment of tree seedlings » Grazing/Browsing Hand releasing may be necessary to control woody weeds. in September just before they have started flushing. One is terbuthylazine, which can be used directly over the seedling trees while they are dormant, i.e. Douglas fir is very sensitive to weed competition, so releasing is recommended for two to three years after planting.ĭouglas fir is also sensitive to many common herbicides and there is a limited range of safe products available. Release spray after planting once weeds begin to regrow. Protect seedlings from browsing by stock and wild animals.Prevent weeds from competing with the Douglas fir seedlings for at least two years after planting.It will tolerate high stockings without losing vigour. The natural form of this species is tall and conical, but can become heavily branched if given space. Plant Douglas fir at stockings of 1250 - 1650 stems per hectare, (3 m x 2.5 m or 2.5 m x 2.5 m spacings) to provide mutual shelter and to control branch growth. New shoots are initially very soft and can be damaged by late frosts or strong winds. Unless there is summer moisture young seedlings will go dormant until the following spring, when they will ‘flush’ with a burst of growth. The young trees benefit from spring and summer rainfall. Although reasonably shade tolerant, Douglas fir should only be planted in open sites free from weed competition, with some shelter and air drainage. Seedlings inoculated with suitable mycorrhizae are required for establishing Douglas-fir on new sites. ![]() Containerised stock can be planted from autumn to spring. Tease out (straighten and trim) any pot-bound roots before firming the soil around them, ensuring there are no air cavities. Plant as per these instructions ».įor containerised stock, dig a hole twice the size of the plant container, leaving some soft soil at the bottom. Plant trees with a slow release fertilizer tablet underneath or put a trowel of high nitrogen fertiliser such as DAP or urea in a spade slit above the seedling.ĭo not "slit and stuff" bare-rooted plants. Make sure the root plugs are moist by soaking in a water trough. Containerised (plug) stock should also be planted as soon as possible after receiving the plants. Take great care in the handling, transport and storage of seedlings, especially bare-rooted stock which must be kept cool and moist and planted as soon as possible after wrenching. High wind exposure, such as experienced in many parts of Wairarapa, Canterbury and the southern South Island, is not favoured. Douglas fir also doesn't like hot summers and is subject to disease throughout most of the North Island, especially where conditions are warm and humid.ĭouglas fir can spread as wildings and the seed disperses considerable distances.Īltitude High altitude Moderate altitude Rainfall High rainfall Moderately high rainfall Moderately low rainfall Soil depth Deep Moderate depth Soil drainage Free draining Moderately free draining Soil depth Deep Moderate depth Temperature Cold Very cold Wind Strong wind Moderate wind On good sites it will grow for more than 500 years, reaching 100 metres high and more than 4 metres in diameter. In New Zealand Douglas fir ranks as the second most important plantation softwood after radiata pine.ĭouglas fir requires cool conditions and is resistant to snow damage, growing best at altitudes of 350 – 950 metres in higher rainfall sites. Douglas fir prefers moist, free-draining un-compacted soils. It is widely planted around the world for its timber, which is stiff and strong. Specialty Wood Products Partnership reportsĭouglas fir is a tall, evergreen conifer native to western North America.Forest Practice Guides and Codes of Practice.Facts and Figures - NZ Plantation Forest Industry.Resource Catalogue ↓ ↑ Resource Catalogue.People and Places ↓ ↑ People and Places.Inventory and Decision Support Software.Forest Management ↓ ↑ Forest Management.Trees for Erosion Control/Soil Conservation.
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