1+1
This term designates a seedling grown for one year in a seedbed, harvested,
root pruned to five inches and transplanted back into a nursery bed at
approximately six seedlings per square foot. The transplanting process
results in a larger caliper and a more fibrous root system. The seedling
will have more side branching, with a minimum of 10 inches in height and
6 millimeters in caliper (stem diameter at the root collar). The
root system on a 1+1 plus the extra storage of food in the caliper and
root system will allow the seedling to survive on an infertile site, compete
with other vegetation and give it a better chance of surviving browse damage.
2+0
This designates a seedling that was grown at approximately 25 seedlings
per square foot in the seedling bed and grown in the field for two years
(never transplanted). After two years the seedling is ready for outplant.
The production costs are low because the seedling had not been lifted,
packed and transplanted as in all of the transplant stock types.
The root systems on such stock type are pruned horizontally in the ground
at a six-inch depth and vertically between each row at the end of the first
growing season. These cultural activities encourage branching of
the remaining roots and promote more fibrous roots required for out planting
survival. This stock type will survive in a site that has low competing
vegetation and minimal levels of animal browsing.
2+1
This stock type is grown in the initial seedbed at 25 seedlings per
square foot. At the end of the second year, the seedling is harvested,
sorted, root pruned and transplanted back into the nursery bed at a density
of six seedlings per square foot. The result is a seedling with a
large caliper and root mass. Minimum sizes for most species at this
stock type are 6 mm caliper and 14 inches in height. This large stock
type is useful for areas requiring quick green up or areas of extreme animal
browse. In most situations, a 1+1 or Plug+1 is very suitable
and less expensive.
Plug (P)
This is a seedling grown in a greenhouse in containers that are narrow
and deep. for some species, this stock type reduces the time between
request and outplant. For some species, growing plug stock type is
necessary due to low germination and early growth. Various sizes
of containers are available but the target is a styro-2A (two cubic inch
containers) if the seedling will be used for a Plug+1 stock type.
A styro-10 will be used if the seedling will be used for out planting.
Plug+1 (P+1)
After growing in the greenhouse for a year, the seedling is extracted
from the container, root pruned at 5 inches and transplanted in a nursery
bed at approximately six seedlings per square foot. As with the 1+1,
the root pruning and transplanting generates a larger caliper stem and
more mass in the root system. Cedar, hemlock, larch and some species
of pine and true firs are propagated as Plug+1.
