Raspberries
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Cultural Requirements: For new raspberry plantings a raised bed 8 to 10
inches high and 18 to 36 inches wide should be formed and the new raspberry starts
planted into it 1 inch deeper than they grew in the nursery. One idea is to use the
cement bed borders that form a circle and using a "Rose Column" for support. These
can be placed artfully into your landscape creating a small Island of raspberries.
Though they do not prevent the root suckering, they do tend to limit the raspberries
"wandering." Raspberry roots tend to travel parallel to the ground and will rarely
dive under objects. This means that only the raspberry roots below the cement ring
will root sucker. This form of landscaping also allows you 360 degree access to your
raspberry plant at the time of harvest. |
Planting Instructions: When planing your raspberry bed, it is best to plan
your rows to run in a north to south direction. This insures that one row will not
shade out the other. This of course is not mandatory. Spacing of your raspberries
is recommend at 18 inches between the plants and 5 to 6 feet between the rows. Make
certain that you dig your planting hole large enough to avoid wading the roots.
Be sure any white sprouts growing from the crown of the new plants are covered at
least 1 ½ inch deep. Prune back the old cane 1 to 2 inches above the soil line.
(Note: All new growth will come from the primary buds on the crown. Not the old cane.)
Do NOT water your raspberries in at this time. There is enough soil moisture to bring
the plants out of dormancy. Water only when you see new growth breaking the ground.
This will help prevent root rot in that a dormant plant is not transpiring water
until the buds break. |
Heritage Red Raspberry |
Young Planting of Fall Gold |
Existing raspberries in the garden will benefit from being "hilled up" by adding a
depth of good quality well drained soil, or even quality potting soil, on top of the
row to a depth of not more than 8 inches. This should be done in late February an
into March before the new spring growth emerges from the crowns. The new growth will
force through the topsoil and root into it. Cane growth is stimulated and possible
root rot is minimized. Raspberries are susceptible to root rot. This is their weakness
and good soil tilth is the best way to prevent root rot. Just pile the soil on top of
the row and AVOID watering it in. |
Researches have recently discovered that Gypsum Lime at a rate of 6 tons to the acre
helps prevent root rot in raspberry plantings. The Calcium ion interferes with root
rot development and Gypsum lime does not change the pH of the soil. In the garden
this amounts to 4 ½ ounces of Gypsum Lime per square foot of garden. We suggest
working the Gypsum into the soil that will form your raised bed. Once this has
been done, plant your raspberries and don’t fertilize until the plants actually
begin growing. Raspberries only need 2 ounces of Nitrogen per 10 square feet of row.
This amounts to only 22 ounces of 10-10-10 fertilizer per 10 square feet. Apply 11
ounces after the plants start growing and another 11 ounces 4 to six weeks later.
This is all raspberries and blackberries need to grow their best!
Pruning and Training: Often only the shoots of suckers that start close to the
original plant are allowed to grow, thus the canes are kept grouped together in the
so-called hill. However, the home gardener may wish to let the hills grow together,
thereby conserving space in the garden. Unwanted suckers arising too far from the
mother plant may be grubbed out as they appear. After the first year when the
raspberries are dormant, thin out the weaker or damaged canes leaving yourself 4 to
6 strong canes per hill.
One-crop or spring crop raspberries fruit on two year old wood. After harvest, the two
year old fruiting wood begins to die and can be removed. The remaining one year old
canes for the next summers crop can be cut back to head height.
Two-crop or everbearing raspberries, as they are known in the trade, are handled much
the same except that they fruit in the fall on one year old canes. The fruit will
appear on the top foot or so of the cane, and it is a common practice to remove the
portion of the cane that fruited after harvest, leaving the rest of the cane to
produce next summer’s crop. The everbearing raspberry thus produces a summer crop
on two year old wood and a fall crop on one year old wood. As with the one-crop
raspberries, the two year old canes die and are removed after the harvest or during
the following winter.
Red raspberries can be supported either with tall stakes or ideally with a two wire
trellis. The wires of the trellis are usually placed about one foot below the height
at which the canes have been pruned. The wires are placed on each side of the post
with large staples or nails. Sometimes cross pieces are nailed to the posts so that
the two wires are 12 to 15 inches apart. A second set of wires may sometimes be
placed a few feet below the top wires. The canes can be tied to the top set of wires.
Certain varieties may need no support at all! The everbearing raspberries fall into
this category.
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