I bought a tomato at the store and squeezed the seeds onto a paper towel. After they dried, I cut the paper around the seed and planted them in good potting soil. Keep damp and you will have tomato plants in about a week. I tried planting seeds immediately after squeezing the tomato and they did not grow, so you must dry the seeds.
I had an older tomato and I wanted to get out the seeds. I filled a bowl of water and squished the tomato under the water. All the seeds were in the water. I threw the tomato part into the compost pile and the water and seeds into my indoor growing houseplant bowls, or out into my garden area where I try to grow seeds from scratch.
It was really easy, and they were watered at the same time they were planted. Later I will throw a few egg shells over them so when it rains, it will give them calcium and also to keep the birds from eating the seeds.
When saving tomato seed for growing your own plants, simply put the wet seed on a paper towel and let them dry. When you are ready to plant them. Cut the size you want to plant and cover with soil. The paper towel will rot in the soil and there is no danger of losing the small tomato seeds as you sow them.
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