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Seed Starting Tips
It would be impossible to cover all aspects of
indoor seed starting in this small space but I would like to mention
some of the key concerns. USE STERILE SOIL Soil from outdoors or
bagged topsoil is not appropriate for seed starting. These soils may
carry plant diseases and are usually too heavy to use for seed
starting . The best choice is a light, sterile, seed starting blend
made from finely milled sphagnum with vermiculite added. We sell
special seed starting soil for this purpose. Some gardeners will add a
1/4" layer of finely milled sphagnum to the surface of the seed
flat after sowing as added insurance against damping off. This is not
the same sphagnum your would buy in a bale for use in outdoor
plantings. It is a very fine, STERILE sphagnum produced just for seed
starting.
TEMPERATUREMost seeds need temperatures between 65 and 80
degrees day and night to germinate. The actual temperature varies for
each seed type, so check the seed pack or catalog to be sure. After
the seeds sprout, the temperature requirement is generally about 10
degrees lower than the germination temperature.
LIGHT Many beginners underestimate the light requirement of
seedlings. Seeds often will germinate with littler or no light only to
flop over due to lack of light. Fluorescent lights should be lowered
to about 2" above the seed flat then raised to 6" when the
seedlings are 1/2" tall. As the seedlings grow, keep the lights
about 6" above the top of the plants. The lights should be on
from 12 to 16 hours each day. Timers are available to turn the lights
on and off. Using timers insures that the plants receive the same
light at the same interval each day.
AVOID OVERWATERING Seeds need moisture to sprout, but young
seedlings are susceptible to dampening off if kept too moist.
Remember, seedlings can tolerate being a bit on the dry side but will
fail quickly if drowned. You should always check the soil before
watering. Some prefer to mist heavily to water their seed flats. If
you use this method, make sure that you mist early in the day so the
seedlings have a chance to dry before dark. This will lessen the
chances of damping off. I prefer to bottom water by pouring water into
the flat containing the potted seedlings. After a few minutes the soil
is moist but the surface or the soil is dry. If you use this method,
be sure to remove any excess moisture from the bottom of the flat. I
use a cotton cloth to draw the water up, out of the flat without
tipping it. Whatever method you use, it is vital that the seedlings
NEVER be left standing in water for more than a few minutes.
HARDENING OFF Many gardeners do a great job growing the
seedlings indoors only to have them fail when they are moved into the
garden. This can often be traced to lack of hardening off. Seedlings
grown indoors, under lights, need a period in which to become
accustomed to real sunlight, wind, and other conditions not found
inside. Find a shady , sheltered spot and give the seedlings a few
days there. Be aware that they may need more water in this location.
If there are cold nights, move them in until morning. Finish hardening
off by putting the seedlings into full sun for a few days before
planting in their permanent location.
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