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Do not accept any plant material that does not
conform to your order/contract and do not accept poor quality plants.
Do not accept heavily sheared evergreens. |
Minimum
tree spade size requirements are from Inspection and Contract Administration
Guidelines for Mn/DOT Landscape Projects, March 1, 1993 edition. |
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The Best Time of Year to Plant Trees and
Shrubs
Spring and fall are the best time to plant trees and
shrubs because temperatures are neither too hot nor too cold and soil moisture
is plentiful. Trees planted during summer need more regular watering. April
through early June is spring planting season and late September to November is
fall planting season. Fall is a time of active root growth for many species.
Root growth continues until the soil temperature falls below 45 degrees F.
Seedlings and bare root trees are best planted in the spring. The
following tree species are specifically not recommended for fall planting:
fruit trees, mountain ash, birch, willow, linden, pagoda dogwood, sumac, oak,
poplar, honeylocust, maple, hackberry, Russian olive, ironwood and hawthorn.
How to Judge Quality
The order form or contract for the
plant material used in the planting project should specify: the species and/or
variety of the plants, the size of the plants and the type of planting stock.
With some plant material, it may also be desirable to specify a grade, or level
of quality, of material. Whether you personally go to pick out the plants at a
nursery or you are simply accepting a delivery, there are several things you
should check before you accept any plants. Look at these:
Species or
Cultivar: Read the tags on each plant. Is it what you ordered?
Size: Are they the right size? Does the root ball size match the
caliper size? For each inch of trunk caliper, the ball should be 11-12 inches
wide.
Plants with good form require less maintenance than plants with
poor form. Look for:
Trunk: straight; above middle of root ball;
branches at regular intervals; no wounds except for superficial scrapes which
do not go through the bark; no discolored, sunken areas, or
holes.
Branches: balanced on the trunk; 2-4 inches of new shoot
growth from previous year; flexible, with healthy, living buds; few broken
branches.
Leaves: should be normal size and color for that plant
at that time of year and should not show spots, blights, distorted shape or
wilting. Reject deciduous bare root material that has leaves on it. Reject
evergreens with limp shoots.
Roots: should not be exposed or
covered by more than 4 inches of soil in potted or B&B stock; in bare root
stock they should be firm, moist and white inside, not dry, black, crushed,
torn or mushy.
Minimum Tree Spade Size
Requirements |
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