Hardening off takes two weeks, and entails gradually exposing your tender seedlings to the elements until they can be transplanted and live outside comfortably.

Beginning the Process

Start the hardening-off process two weeks before the seed’s outside planting date, which is dependent on the hardiness of the plant and the last frost date in your area. Once you’ve determine the date, begin by setting your seeds outside for a couple hours during the day in an area that’s shielded form sun and wind. Direct sun is a definite no-no for young seedlings at this stage, because it will burn the tender leaves. Remember to bring your seedlings in at night. Over the following days, you may increase the time your plants go outside, but do so gradually.

Your Seedlings are Almost Ready

After a few days of gradual and protected outside exposure, you can step up your efforts a notch. Leave your plants out longer and put them in sunnier, cooler, and windier spots. Although some evidence suggests that tomatoes respond well to fertilization at this point, generally it’s not a good idea to feed or overwater your plants right now – remember, you’re trying to toughen them up!

Ready, Set, Grow!

After two weeks of increasing exposure, it’s time to plant them for good. Water the ground thoroughly, and dig a hole just a few inches deeper than the pot in which your seedlings are currently residing. Holding your seedling by the stem, place the seedling in the hole and cover it gently with soil. Once the hole is filled, create a depression around the rim of the plant where water can collect. Be sure to water frequently and to fertilize after this final step. If your weather turns nasty, you can protect your seeds with sun shields, wind blocks, or Gurney’s Tunlcover™ Plant Protector cold covers.

To sprout, most seeds prefer a temperature between 70 and 85 degrees (for specific temperatures, see the back of your seed packet). Seeds can be kept in any place that offers warmth. Windowsills can also work, but be sure to check them for drafts that could potentially end your seedling’s short life. You can check by running a lighter or candle along your windowsills; if the light flickers or goes out, you know you’ve got a serious draft. If your windowsills prove to be too drafty, you can use artificial lights. The heat provided by an ordinary shop light offers plenty of warmth for germinating seeds. Once you’ve found a cozy spot for your seeds, it’s time to cover them with plastic (to keep in moisture) and wait for them to send their shoots above the soil line.

They’re Alive!

Immediately following your first sprouts, remove the plastic covering to get essential oxygen to the young’uns. These sprouts are not “true leaves”; they’re cotyledons, which existed within the seed and fed your plant during germination. You’re on the right track; true leaves will appear soon. Remember, even though they’ve sprouted, your seeds still need temperatures in the 60-to-80-degree range to ensure proper growth. Seeds also need light at this stage. If you’re growing with natural light, make sure the containers are raised a little above the sill to minimize the “stretching” seedlings can experience in their efforts to get enough light, and turn then regularly to keep them from growing lopsided.

Artificial light provided by fluorescent shop tubes or grow lights (household incandescent lights don’t offer the right light spectrum for plants) work best, just make sure they offer a combination of warm white and cool white light. Artificial light should be kept 1 – 4” above your seedlings’ tops. Pulley systems work especially well, because you can adjust the lights as the seedlings grow. Seedlings need roughly 16 hours of exposure daily; using a timer on the lights is the easiest way to achieve this. Some gardeners leave the lights on continuously and say their plants have suffered no ill affects. The choice is yours; consult your seed packet for lighting instructions.

Let’s Get Started

Once you’ve found the right seed varieties for you, you’ll need to determine the proper start date. Typically, seeds are started indoors 8 to 10 weeks before the last frost.

Get your seedlings off to a good start by using the right growing medium. A perfect growing mix is very light and holds moisture well. Avoid using potting soil, which becomes too dense after a few waterings and doesn’t allow good air and water circulation. Additionally, regular potting soil can introduce bacteria to a young seed, resulting in its death. If you don’t want to buy a mix, you can create your own by combining 2 parts peat or sphagnum moss with 1 part perlite and 1 part vermiculate. This will not have the nutrients usually included in a commercial mix, however.

Where to Start Your Seeds

The first container for your seeds should be no more than three inches deep and provide good drainage. If you don’t want to buy containers specifically designed for starting seeds, you’ll need to create your own: empty egg cartons, cut-off milk cartons, or deep-sided disposable aluminum pans work fine. Make sure you punch drainage holes in the bottom.

Planting Your Seeds

The general rule of thumb is to plant seeds four times as deep as the seed is wide. Fine seeds, such as petunia seeds, should be sprinkled on top of the medium but not covered. When using individual containers, plant more than one seed in each cell; you’ll need extras since you seldom get 100% germination. If you’re using flats, space seeds a half inch apart only if they’ll be transplanted into a separate pot following germination. If they’re going to stay in the flat until they head outside, space the seed one to two inches apart. Label your seeds, because most seedlings look alike.

Watering Your Seeds

Once they’re planting, you won’t have to worry about feeding your little guys at first. Seeds contain their own food supply packaged neatly within their shells. Make sure you keep them mist, since most seeds absorb water and use it to bust through their shells. Daily checkups are necessary at this point. To water, you can either use a spray bottle, or set up a bottom watering system (this way, seeds can take as much water as they need.) If you choose a bottom watering system, it’s important to avoid letting your pots sit in a pool of water; this can lead to a moldy pot and a dead seed.

This is why we have started a new series here at Gurney’s Blog called “The Minimalist Garden.” Each month, we will discuss ways you can simplify and organize different aspects of your garden! Today’s entry: Vegetable seeds!

If you have a garden space, you can easily get by with a 4’ X 4’ area. No garden? No problem. Just get a half a dozen large pots, about 18-24” across the top, and fill ‘em with potting soil. Vegetables like lots of light, so both garden areas and pots need to be in a sunny spot.

Fresh veggies have lots of advantages. You know where they came from, you know what was put on them, and you will never get anything fresher. Ideally, you’ll want to start them from seed, so that you can be in complete control of your garden edibles. That’s why we’re focusing on vegetable seeds!

So what are you going to grow? Well, that’s up to you, of course. I like to grow lettuce, tomatoes, radishes, and maybe some spinach, but that’s me. Maybe you could try a pepper? Those are always fun to grow.

Okay, so let’s assume lettuce is on your list (since it’s so easy to grow from seed). You can start lettuce as soon as winter’s last frost has passed (now, for most areas). First, moisten the soil. Next, get a small piece of wood, like a ruler. Press the edge into the surface to make a tiny valley. Sprinkle the seeds into your mini-valley ever so gently; try to get them about a half-inch apart. Press the soil back over them so they are about a quarter-inch deep.

Water lightly, and wait a few days for the seedlings to appear. When they are about 2” high, you’re ready for your first garden-fresh salad! You have to thin them out anyway, so might as well enjoy the greens. You’ll want to clip the plant down to about the soil level. About a week later, do it again, removing every other plant.

Lettuce and spinach will re-grow if you cut them about 1-1/2” above the ground, just above the heart of the plant. This method will get you several salads per plant. You can even sow the lettuce and spinach seeds at different times so you can enjoy fresh salad uninterrupted!

The tomato varieties best suited to a small space are the cherry types. They come in all kinds of colors, and they are crazy prolific. Most cherry tomatoes need to be tied to a stake, and they’re very easy to start from seed.

Radishes come in three varieties: the familiar round, red balls; longer French types that look like red baby carrots; and Japanese daikon radishes. The first two pop up and mature with a couple weeks, while daikon takes twice as long. For a constant supply, sow more seed every two weeks, and make sure you thin them out, or they’ll get spindly roots that won’t fill out.

With these few plants, you can legitimately call yourself a vegetable seed gardener! Now go enjoy yourself a fresh and wholesome harvest!