What I do for good root growth is to do at least two potting ups to allow for deeper "repotting" of the seedling, resulting in some covering up of the lower portion of the stem. This takes advantage of tomato seedlings adding roots to the stem parts that are covered with mix. In the end, it forces the plant to work heavily on the root system before you take it to the main garden where a larger and more robust root system is very important.
Typically, my process is to move small seedlings into individual cells in a 72 cell tray. Then they go to a 9 oz plastic cup and from there to the garden.
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Ted
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Owner & Sole Operator Of
The Muddy Bucket Farm
and Tomato Ranch
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