Currently, I am starting two house plants from cuttings, simply in glass bottles. This is very easy and rooting tomato cuttings in water is just as simple. Tomato cuttings are amazingly fast and easy root growers. To begin, look for some of the sucker shoots on the chosen tomato plantthat do not have buds on them. With sharp pruners, cut about 6-8 inches of the sucker or new growth at the tip of the branch. Then, you can simply immerse the tomato cutting in water or plant it directly into some soil medium. In water, the cutting should root within about a week and will be ready to transplant.
Roots will be stronger, however, if the cutting is allowed to root in soil. Also, rooting directly into soil medium skips the “middle man” since you are eventually going to transplant the cuttings to soil, you might as well start propagation there.
If you choose this route, it is also extremely easy. Take your 6- to 8-inch cutting and clip off any flowers or buds, if any, and snip off the bottom leaves, leaving only two leaves on the cutting. Put the cutting in water while you prepare the soil. You can root in peat pots, 4” containers filled with damp potting soil or vermiculite, or even directly into the garden. Make a hole with a dowel or pencil for the cutting to slip easily into and bury it up to where you cut off the lower leaves.
Put the cuttings in a warm, but shaded area either indoors or out. Just be sure it isn't scorching hot and the plants are protected from sun. Keep them moist in this area for a week to acclimate and then gradually expose them to stronger light until they are finally in the sun for most of the day. At this point, if they are in containers, you can transplant them into their permanent large pot or garden plot.
Tomatoes are actually perennials and can live for years in warm climates. However, they do not produce fruit in their successive years nearly as well as the first. This is where overwintering tomato cuttings for spring clones come into play. This idea is especially useful in areas of the southern U.S. Just follow the above instructions up to transplanting the cuttings into a larger pot and keep in a warm, sunny room to overwinter until the spring.
Voila! Tomato propagation couldn't be easier. Just remember to take cuttings from plants that have the best yields and tastiest fruit, as the cuttings will be a virtual clone of the parent and, thus, retain all its characteristics.