Eucalyptus grandis (flooded gum, rose gum)
Viable seeds / kg (approx.): 763,000
Minimum purchase: 25 g
E. grandis is native to Australia, but it is extensively planted in Africa, India,
and Central and South America. Under natural conditions it can reach heights of up to 55 m, usually with a single straight trunk, although in plantations it is normally harvested with smaller dimensions.
The wood is lighter and softer than that of most eucalyptus, with a pale
color that turns reddish brown in maturity. It is of moderate durability,
straight grain and rough texture. It is used for the production of poles,
sawmill, plywood, paper and pulp and construction in general.
In its natural habitat it grows at altitudes from 350 to 900 masl. In
Central America it has been planted from 100 to 2200 m, in places with mean
annual temperatures of 29-35ºC and mean annual rainfall of 1000-1800 mm, well
distributed throughout the year, since it does not tolerate drought.
It prefers deep soils, well drained and humid, alluvial or volcanic, and
does not thrive in swampy conditions.
Seeds and nurseries
It does not require
pre-germination treatments. Due to the small size of the seeds, germinators
should be used, with a loose substrate such as river sand, well washed and disinfected,
in which the seed is placed superficially. Germination occurs in a period of
5-12 days, reaching conditions for transplanting 1-2 weeks after germination. The
root is usually very long, so it must be pruned to about 3 cm in length. When
transplanting, be sure to make a hole deep enough in the substrate to avoid
curving up of the roots. Shade should be provided for the first 2-3 weeks after
transplanting, for instance using shade clothing (saran) 50%. The plants will be ready for field planting after 3 -
4 months or when they have a height of 15 to 20 cm. A couple of weeks
before planting out in the field it is recommended to reduce watering to
stimulate the lignification of the stems.
E. grandis is a fast growing species, with annual increments of 3.2-5.3
m in height and 3.2-6.1 cm in diameter. For sawmill
production, initial spacing should be at least 3 x 3 m. For production of
firewood, posts or tutors, high densities (up to 5000 trees / ha or more) are
used, generally with spacing arrangements from 1 x 1 m to 2.5 x 3 m. It
is also suitable for agroforestry combinations. The species sprouts vigorously
once cut, so that shoot management has been used in many countries as the
preferred method for renewal of plantations.
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