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In previous years, I've noticed my tomatoes have root-like buds towards the base of the stem, but haven't wanted to experiment in case I wreck them.

Anybody had any experience of this? Is it worth it?

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If you notice these before you transplant, make sure you bury them a little above the level of those buds –  Peter Turner Jun 25 '11 at 15:18

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up vote 13 down vote accepted

The hairs on tomato stems will turn into roots, given the right conditions (this makes taking cuttings of tomatoes extremely easy). If you let them grow along the ground, they'll root in various places where the vine touches dirt and stays reasonably moist.

As long as your compost is well aged, and won't burn the plants, there shouldn't be anything wrong with piling it up near the bases of the tomatoes. If it's not well aged, the microbes may cause some rotting, though. I generally prefer to top dress in rings around my plants, rather than pushing it up next to the stems.

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fyi, it's not the hairs that turn to roots. They emerge from the stem. –  J. Musser 21 hours ago

Some gardeners intentionally mound soil against the base of a tomato plant as it grows to encourage the production of additional roots. I have done this but I have not observed any obvious benefits in terms of overall plant health or the number of tomatoes produced. Another approach is to plant the seedling in a slight depression, and then to mound the soil against the base as the plant grows.

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