This species is appropriately called the giant or grand fir because it's one of the tallest growing firs in the world, usually in the 200- to 300-foot (70 to 100 m) range. This evergreen is very fast growing, attaining a narrow column-like or spire-like silhouette with massive trunk. Native to the central Pacific coast of North America, the giant fir grows in British Columbia inland to the Idaho-Montana mountains and southward to northern California, where it's known along the coast. Some botanists find distinct physical variations among trees that grow east and west of the Cascade Mountains.
The bark is smooth and gray, but cracks into square plates on the oldest trees. Needles are soft, shiny and dark green with white bands on the undersides. The needles resemble the teeth of a two-sided comb. The cylindrical, pendent female cones are green but ripen to brown, usually with whitish globs of resin.
Grand fir is one of the more shade tolerant fir species, but looks fuller and more robust when grown in full sun. Plant it in a moist, acidic soil that's deep and rich in organic matter for best performance. Although grand fir matures to smaller heights in cultivation compared to a dense forest habitat, it's still too large for the vast majority of garden settings. Conserve trees that may already exist on a property, cutting off lowest limbs as needed for vehicular clearance or overall safety. (Info source: Learn2Grow.com).
Genus - Abies
Species - Grandis
Common name - Grand Fir
Pre-Treatment - Required
Hardiness zones - 5 - 7
Height - 80'-300' / 24 - 100 m
Spread - 15'-25' / 5 - 8 m
Plant type - Tree
Vegetation type - Evergreen
Exposure - Full Sun, Partial Sun, Partial Shade
Growth rate - Fast
Soil PH - Acidic, Neutral
Soil type - Loam, Well drained
Water requirements - Average Water
Landscape uses - Feature Plant, Screening / Wind Break
Germination rate - 68%
Leaf / Flower color - Dark Green / --
|Germination||A short period of cold and moist stratification (in the fridge) needed.|
1. Soak the seeds in clean water for 24 hours. Fully drain away all of the water and place the seeds in a zip-lock freezer bag. Place the seeds in the fridge. Make sure the seeds during this period not dry out or are waterlogged otherwise the pre-treatment will be ineffective.
2. After 6-8 weeks of the pretreatment seeds are ready to be sown.
3. Sow in a good quality potting compost. It shoudl be sterile and clean, never used before. Firm the compost gently, water and sow the seeds on the surface. Cover the seeds lightly (~2 mm) of vermiculite or sieved compost. Keep moist and at room temperature.
4. Germination will begin in a few weeks.