Best Tips for Growing Seeds Indoors

Save money on vegetable seedlings and grow superior varieties of vegetables by starting seeds indoors.

By Barbara Pleasant
Updated on November 11, 2024
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by Adobestock/Aleksey
Hand planting seedlings in pots for indoor gardening setup, nurturing young plants for home garden projects. Growing plants in containers for sustainable living and ecofriendly plant care

Start growing seeds indoors this winter and learn how to grow seeds indoors for spring garden planting.

I began growing my own vegetable seedlings more than 30 years ago, and I still remember my sad first attempts. Many seedlings keeled over and died, and some seeds never germinated at all. Experience has taught me how to prevent these problems, and every year I deepen my garden’s diversity, save money and share favorite varieties with friends by starting seeds indoors. Thousands of superior crop varieties are rarely available as seedlings in garden centers, and the same goes for wonderful culinary crops, such as red celery and seed-sown shallots. If your gardening goal is to fill your table and pantry with an array of homegrown organic food, then starting plants from seed can help you achieve that goal. Starting seeds indoors under controlled conditions, with no aggravation from weeds or weather, allows you to get a prompt start on the season, whether you are sowing onions in late winter, squash in summer or lettuce in early fall. And where growing seasons are short, some crops require an indoor head start to later reach maturity.

How to Grow Seeds Indoors: The Germination Process

All seeds contain specialized cells that mobilize and grow when the germination process is triggered by moisture, temperature and sometimes light. Moisture and stored nutrients energize the embryo, which contains the latent structures for a plant’s root, stem and leaves. Most vegetable seeds that germinate quickly (such as cabbage and tomatoes) enter their dormant state with mature, fully formed embryos. The carrot family is at a disadvantage, however, because most Umbelliferae seeds (think parsley, fennel and dill) need time for their underdeveloped ovaries to grow before they can sprout. Other slow sprouters — spinach, for example — have compounds that inhibit germination in their seed coats. These compounds have to break down in the soil before the root and sprout can burst forth into the world.

Oxygen is vital to the germination process. Until seedlings have leaves to enable them to use solar energy, they rely on the food reserves in the seed combined with oxygen found in the soil to grow new cells. This is why you should always use a light-textured potting medium to start seeds, and why over-watering can cause seeds to rot instead of grow.

Appreciating the hard work that seeds must do during the germination process will likely enhance your seed-starting experience. You can watch time-lapse videos online of fast-growing bean seeds germinating, but watching them in person is even more amazing. The seeds that impress me most are squash. By the time the seedling leaves shed the seed coat, the little plant is already supported by a small mountain of roots.

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