The Yellow Farmhouse Garden

If  you have sown your seeds correctly and placed them in a warm area, they should germinate and emerge from the soil  within a few days.

Take your germinated seeds off of the heating mat and get them into some bright  light. Your heat mat can be now used to start the next batch of seeds.

Not all of us have access to a greenhouse or a sun room to grow our newly emerged seedlings.  A bright, sunny window with a southern exposure works almost as well.  The other alternative is to place the seedlings under florescent lights. Two 40 watt fluorescent tubes  will provide all the light your baby plants need.  Special “grow lights” or “full spectrum” are really not necessary just use an ordinary shop light.  The trick is to make sure the seedlings are about 2 inches from the lights, certainly not more than 3 inches.

Use an ordinary shop light for your growing seedlings

The young plants need only about 15 to 16 hours of light a day.  They must have a dark period in order to grow properly.

Direct the air from a small fan onto your growing seedlings.  The movement caused by this small amount of air helps strengthen the young plants and helps prevent fungus from infecting them.

If you notice that your plants are getting “lanky”, top heavy, or lean toward the light, then you know they are not getting enough light, so make the necessary corrections to improve the lighting conditions.  Often they will get so top heavy that they will fall over.  If this happens, transplant them into another container at a deeper depth.  Many times you can salvage your seedlings in this manner.

Fluorescent tubes do give off some heat. This heat combined with the fan may tend to dry out the potting mix a little so be sure to check on your seedlings a couple of times a day…they are babies after all!

As your seedlings start to grow, keep an eye out for a problem called “damping off”.  It is disheartening to get to the point where the seeds are up and growing fine only to find one morning that the plants have fallen over and are starting to die.

Damping off is caused by a fungus that usually infects the seedlings’ stems right at the soil line.  You will notice that the stem of the seedling is shriveled. The plant cannot recover at this point. The most common cause is using potting containers that were not properly cleaned or using seeding mix that was not sterilized. Lack of air movement and soggy soil can also make the problem worse.

Fertilize your seedling every other watering or so with a diluted half-strength solution of soluble plant fertilizer. Use distilled or RO water for your seedlings. Chlorine from city water can damage them.  If you don’t have access to distilled water, leave a potful of tap water out overnight to let the chlorine “gas off”.  Placing the growing container in water and letting it soak up from the bottom will help keep your seedlings from being knocked over by a stream of water from the watering can.

Eventually your seedlings will need to be transplanted. We’ll discuss that and other things in the next post.

Bob

There are two schools of thought on how to best fill containers for starting seeds.

One idea is to fill the flat with dry soil mix and then moisten it by watering it from the top with a sprinkling can; or you can set the flat into a pan of water and let it wick up into the mix.  Both ways are fine although watering from the top is often quicker if you need to get it moist in a hurry for some reason.  The overhead water also packs down the soil mix slightly making it somewhat denser.

The second idea is to moisten the soil mix before placing it into the pot.  This is done by adding water to the mix either directly into it’s original bag or by moistening only part of it in a bucket or tub.  It’s easy to over-do the watering and end up with a water-logged soil mix which then has to be allowed to drain before using.

If you are using starting mix that you have moistened ahead of time, scoop up some mix and place it into the flat or pot and level it off.  Then lightly bump the tray on the table top once or twice to settle in the mix.  Resist the urge to pack the soil into the container with your fingers, that will reduce the needed air space in the soil.  Remember, it’s  not like making sand castles!

Different seeds have different germination requirements.  Some need a cold period, some need to be soaked, some need to be treated with growth hormones, some even need to pass through the digestive tract of an animal! We won’t worry about any of those types of seeds in this discussion, for now we’ll stick to the most common requirements.

The most important thing you need to know is whether or not the seed requires light to germinate.  Generally speaking, the larger seeds can be covered while the very tiny seeds need to be sown on top of the mix.  Check the seed packet to be sure.

Seeds that need to be covered should be placed about 2 or 3 times their diameter below the soil.  While small surface sown seeds should  be lightly pressed into the top of the mix so the seed makes good contact with the soil.

You can choose to sow your seeds into rows in the container, in which case you will need to transplant them later. Or you can sow two or three seeds per cell in your flat (or pot).  Later you will save the strongest seedling and discard the others.

As a guide, sow large seeds about an inch apart; medium seeds about 1/2″ to 3/8″ apart; and tiny seeds about 1/4″ apart.

Since germinating seeds need high humidity,  cover your container with clear plastic of some sort.  Be sure to keep the plastic propped up off of the surface of the soil.  For greenhouse flats, clear plastic “domes” are available.

Put your newly planted container in a warm spot to hasten germination. Placing them on a seed starting heat mat is ideal. These electric mats usually come with a built in thermostat to keep your tray at the ideal temperature for germinating most garden seeds.

Heat mats for seeds are readily available at garden centers.

Some seeds will emerge from the soil within a day or two while others take longer.  After they are up, they need to be cared for, we’ll discuss how to do that and how to avoid potential problems in part six of our series.

Bob