Many vegetable gardeners get a jump on the growing season by starting their own seeds indoors and February is the time to begin seeding cool-season crops such as onions, cabbage, Brussels sprouts, cauliflower, lettuce and greens. These crops can be transplanted outdoors into the garden even before the last frost of the season depending upon soil conditions.
Resist the temptation to start seeding warm-season crops indoors too soon, as these crops should be planted outdoors only after the last frost of spring, which typically occurs around May 1 in Greater Columbus. Warm-season crops include pepper, eggplant, tomato, beans, squash, melons, corn and others. Seeds of warm-season crops such as these should be started 6 to 8 weeks before the average date of the last spring frost, which means these seeds should be started indoors after March 6. Seeding any crop indoors too early can cause seedlings to become root-bound before they are transplanted and can make it more difficult to harden-off or acclimate larger seedlings to the outdoor environment in spring.
Benefits of growing your own seedlings
There are many benefits to starting vegetable seeds indoors, but the ability to select a wider range of varieties of crops is tops on the list of benefits for me.If you purchase seedlings at a garden center in May, few varieties of specific crops are typically available. Selecting varieties of vegetables with the exact traits you desire is more easily accomplished when you select the seeds you want and start them indoors. Starting seeds indoors also allows you to grow varieties of plants which have been proven to perform well in the specific conditions of your garden in past growing seasons.
Starting your own seeds can also save you money as purchasing a single seedling can cost more than an entire packet of seeds in some cases. But perhaps the greatest benefit to growing your own seedlings is the satisfaction and enjoyment that comes from getting a jump on the growing season and being able to actively garden during the winter in Greater Columbus.
Sunny windowsills rarely work
Lots of light will be needed to successfully start seeds indoors. The natural light received on a windowsill is seldom enough for good, strong seedling growth. Plant stems typically stretch and lean toward the light outdoors and will not produce sturdy plants.Acceptable growth rarely occurs on windowsills, although south-facing large bay windows and solariums can sometimes work.
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Supplemental light will be needed to have success with growing seedlings indoors, with fluorescent light fixtures and tubes being the best options for growing transplants indoors. Light needed to grow seedlings indoors is measured by its intensity (closeness and brightness), duration (length of time the light is available), and quality (includes both red and blue wavelengths). Many types of grow lights are designed specifically for starting seeds indoors and are available to purchase online and in garden centers. Once you decide which lights you will use, you can design your growing space and determine which pots and trays will fit best with the size of the light fixtures you have chosen.
Getting started
Seeding trays and pots should be cleaned and sterilized before planting. Check lights and fans to be sure that they are in proper working condition.
Be sure to purchase the proper seeding media for starting your seeds indoors.Although an all-purpose or multi-purpose potting mix may work well for larger seeds such as squash or cucumber, a seed-starting mix that is designed specifically for starting seeds should be used for smaller seeds such as tomato, pepper, lettuce, eggplant and others.
A seedling heating mat placed under trays and pots can be especially helpful with warm-season crops and flowers. These crops require warmth to germinate, and if your growing space is in a cool location such as an unfinished basem*nt, the extra warmth may be needed for optimum germination.
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Clear plastic domes that fit over the top of your trays can help keep the soil moist when seeds are germinating and seedlings are just getting started. These domes can be purchased online or at a garden center, or you can make your own out of clear plastic “clamshell” containers that small fruits, vegetables and salad greens are sold in at the grocery store.
Be sure you have a good plastic hand-held sprayer to wet the planting media without disturbing tiny seeds.A watering can with a narrow spout is most useful for watering seedlings after germination.
Selecting varieties
If you are unsure about which varieties of a specific vegetable crop to plant, check out our list of top producing vegetable varieties at go.osu.edu/2024topveggieproducers. This list contains vegetable varieties which have performed best in our Master Gardener Volunteer Veggie Trials garden on the OSU Columbus Campus. Varieties are evaluated for characteristics such as yield, taste, and insect and disease susceptibility. Vegetable plants grown in our Veggie Trials garden are grown in conditions similar to home vegetable garden sites in Greater Columbus.
Growing vegetable transplants indoors is about the most fun a gardener can have in February in Greater Columbus.
Mike Hogan is an Extension Educator, Agriculture and Natural Resources, and associate professor with Ohio State University Extension.
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Starting Seeds Indoors for Vegetable Gardening
Starting seeds indoors is a common practice among vegetable gardeners to get a head start on the growing season. In February, it is recommended to begin seeding cool-season crops such as onions, cabbage, Brussels sprouts, cauliflower, lettuce, and greens. These crops can be transplanted outdoors before the last frost of the season, depending on soil conditions.
However, it is important to resist the temptation to start seeding warm-season crops indoors too soon. Warm-season crops, including pepper, eggplant, tomato, beans, squash, melons, and corn, should be planted outdoors only after the last frost of spring, which typically occurs around May 1 in Greater Columbus. For warm-season crops, it is recommended to start the seeds indoors 6 to 8 weeks before the average date of the last spring frost, which means these seeds should be started indoors after March 6.
Starting seeds indoors offers several benefits for vegetable gardeners. One of the main advantages is the ability to select a wider range of varieties of crops. When purchasing seedlings at a garden center, only a few varieties of specific crops are typically available. Starting seeds indoors allows gardeners to choose the exact traits they desire and grow varieties of plants that have been proven to perform well in their specific garden conditions.
Another benefit of starting your own seeds is cost savings. Purchasing a single seedling can sometimes cost more than an entire packet of seeds. By starting seeds indoors, gardeners can save money and have more control over their gardening expenses.
In terms of lighting, it is important to note that sunny windowsills rarely provide enough light for strong seedling growth. Natural light received on a windowsill is usually insufficient, and plant stems may stretch and lean toward the light, resulting in weak and leggy seedlings. To ensure successful seedling growth, supplemental light is needed. Fluorescent light fixtures and tubes are considered the best options for growing transplants indoors. The light intensity, duration, and quality are important factors to consider when providing light for seedlings.
When getting started with seeding trays and pots, it is recommended to clean and sterilize them before planting. Additionally, it is important to purchase the proper seeding media for starting seeds indoors. While an all-purpose or multi-purpose potting mix may work well for larger seeds, such as squash or cucumber, a seed-starting mix designed specifically for smaller seeds, such as tomato, pepper, lettuce, and eggplant, should be used.
To provide the optimal conditions for warm-season crops and flowers, a seedling heating mat placed under trays and pots can be helpful. Warm-season crops require warmth to germinate, and if the growing space is in a cool location, such as an unfinished basem*nt, the extra warmth provided by a heating mat may be needed for optimum germination.
Clear plastic domes that fit over the top of trays can help keep the soil moist during germination and when seedlings are just getting started. These domes can be purchased online or at a garden center, or you can make your own using clear plastic "clamshell" containers that small fruits, vegetables, and salad greens are sold in at the grocery store.
In terms of watering, a good plastic hand-held sprayer is useful for wetting the planting media without disturbing tiny seeds. A watering can with a narrow spout is most useful for watering seedlings after germination.
If you are unsure about which varieties of a specific vegetable crop to plant, you can check out a list of top producing vegetable varieties at go.osu.edu/2024topveggieproducers. This list contains vegetable varieties that have performed best in the Master Gardener Volunteer Veggie Trials garden on the OSU Columbus Campus. These varieties are evaluated for characteristics such as yield, taste, and insect and disease susceptibility, making them reliable choices for home vegetable gardens in Greater Columbus.
Starting vegetable transplants indoors can be a rewarding and enjoyable activity for gardeners, providing a jump-start on the growing season and the opportunity to actively garden during the winter months in Greater Columbus.
I hope this information helps you with your vegetable gardening endeavors! If you have any more questions or need further assistance, feel free to ask.
