How to Harvest Your Own Seeds from Garden Plants

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It is easy to save seeds from one year to the next if you know what you are doing. Every plant is different and some seeds require specific strategies for harvesting and saving, but these general rules work for most plants if you know the planting conditions for your seeds.

I indicate the planting instructions on the jar when I save the seeds. This refreshes my old memory and ensures that inexperienced gardeners can use the seeds if I’m not around. This is a good practice for all your saved seeds.

Heirloom Seeds

You’ll hear this repeated often, but it is not a hard rule. Heirloom seeds produce a plant that is true to the parent with the same characteristics as the parent. Hybrid seeds give you characteristics from prior generations that may not be the ones you are trying to produce.For example, hybrid seeds can produce plants that are a mix of the parents or possibly plants that have the worst characteristics of the parents or even grandparents. They may be poor producers, have poor flavor, produce small fruit, etc. I always prefer heirloom seeds; but, if hybrids are all you have, you can grow them. Just be sure to save a lot of seed so you can prune out the poor plants.

Related: Heirloom Seeds Vs. Hybrid Vs. GMO

Choose Your Seeds

How to Harvest Your Own Seed from Garden Plants

Gather the seeds from your best-producing plants, the ones you are most proud of. Hopefully, the seeds will produce an equally good plant the next year. Seeds from mediocre or poor producers will give you poor results. Always choose the best.

Harvest seeds from ripe fruits and vegetables. This one should be obvious to everyone but often is not. The fruits and vegetables you buy at the store are usually picked immature and will not produce mature seeds. For best results, let the seeds mature on the plant before harvesting. In most cases, this means leaving the vegetable or fruit on the plant longer than you usually would. Cucumbers turn yellow when mature, fruits become soft.

I have a friend who plants the seeds from everything she eats, including immature seeds. She has good results in growing plants this way, but not all the seeds germinate. She succeeds because she plants many seeds and some will germinate. In a survival situation, I would follow this strategy, if these were the only seeds I had.

Fermenting Seeds

How to Harvest Your Own Seed from Garden PlantsCucumbers, melons, and tomatoes have a slippery coating that is easily removed by fermenting the seeds. The seeds will grow without this step, but it makes it easier to clean the seeds and store them. If you are processing seeds from one tomato, you may get away with doing it in the kitchen, but fermentation is smelly so I usually put them in a warm, out of the way spot. Here is the process:

#1. Scoop out the seeds into a glass, jar, cup, or deli container. Add enough water to cover them and put the container in a warm spot. Avoid direct sunlight, but some light is ok.

#2. Stir the seeds daily. Initially, the seeds will float. As they drop to the bottom, they are ready. Rinse away the liquid and vegetable matter and spread the clean seeds on a screen or paper to dry. It will take from two days to a week, depending on the seeds.

#3. Dry the seeds on the countertop, or other warm spots, until completely dry. This can take two or more weeks. If the seeds are put away moist, they will mold in storage.

#4. Follow the directions for storing seeds below.

Related: 18 Plants That Should Always Be Planted Together

Stratification and Soaking Seeds Before Planting

Some seeds require a period of cold weather in order to germinate. If you live in an area with ideal conditions, you can plant these seeds in a pot or in the ground in the fall or winter and they will be ready to germinate in the spring. You can also stratify them in the refrigerator or freezer before planting.How to Harvest Your Own Seed from Garden PlantsStratification is usually needed for hard seeds like grape seeds and stone fruits. Some may need alternating periods of freezing and thawing. Other seeds need to be soaked before planting. It is a good idea to know the growing conditions for the plant when you save the seeds so that you can be successful with it the next year.

Drying Seeds

Most seeds only need to be dried thoroughly before saving them for the next year. Remove the seeds from ripe fruits and vegetables and remove any attached pulp. Some seeds, such as peas or beans, should be allowed to begin drying on the plant. Pick them dry, as they begin to burst open and lose the seeds.How to Harvest Your Own Seed from Garden PlantsSpread the seeds out on a screen or on paper to dry. Allow plenty of airflow around the seeds and dry them until they are completely dry. Allow one to three weeks, depending on the size and type of seed.

Storing the Seeds

There has been much controversy about storing seeds, especially for long term storage. Most gardeners agree that seeds should be stored dry, with a desiccant, if possible. Moist conditions can cause mold and spoilage. However, I don’t recommend using an oxygen absorber in the jar. Seeds are living and need oxygen.

Store the seeds in a labeled, air-tight container. Some gardeners place the seeds in labeled envelopes and this works well for storing for one or two years. I prefer to place my seeds in air-tight containers with a desiccant for longer storage. The seeds will keep longer, but the germination rate will drop with each passing year.

Seeds need a cool, dry place. Many gardeners save them in the refrigerator, but I find it to be too moist for my needs. A dry spot in a cool basement or cellar is ideal. Keep them out of the freezer unless you are instructed to freeze for stratification purposes. Most seeds will not survive to freeze.

Related: DIY Seed Tapes With Toilet Paper

Saving Corn for Seeds

Like other vegetables, corn needs to be grown to maturity for the seeds to produce. Allow the ears to remain on the plant beyond the normal harvesting time.How to Harvest Your Own Seed from Garden PlantsThe corn will mature and begin to wrinkle as it dries. You can pick it partially dry and complete the drying indoors, if necessary, but allow it to stay on the plant as long as possible. Because corn is wind-pollinated, I choose ears that are grown away from other varieties, as much as possible.

Planting Peaches, Cherries, Nectarines, and Other Stone Fruits

The pits of stone fruits can also be planted to grow a new tree. These seeds often need a period of cold stratification in order to germinate, so check the requirements for your particular fruit before planting. Pits from stone fruits have a hard casing around the internal seed.How to Harvest Your Own Seed from Garden PlantsThey will sprout more easily if you tap the pit with a hammer to remove the outer casing before planting the internal seed.

Harvesting Seeds from Herbs, Small Seeds

When harvesting seeds from herbs and flowers, a different strategy is required. Allow the plant to flower and leave the flower to go to seed. (Once the plant flowers the herbs are usually bitter, so do this at the end of the season.)How to Harvest Your Own Seed from Garden PlantsAs the flowers begin to die, either attach a paper bag over the seed head to catch the seeds or cut the seed head from the flower and place it in a paper bag to dry. Small seeds are easily lost if not contained for drying. The seeds usually turn dark brown to black when dry and mature.

Once the flower heads have dried and the seeds are released, separate the seeds from the other vegetable matter and store them as mentioned above.

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