Gardening

Seedlings: To Pinch or Not to Pinch?

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Pinching is just what it sounds like: you “pinch off” the terminal bud between thumb and forefinger.

When my father taught me how to start plants from seed some 50 years ago, pinching was a very common practice. You used to pinch seedlings when they had 4 to 6 true leaves and it was almost universally applied to annuals and herbs, although rarely to vegetables.

Pinching means removing the terminal bud, the plant’s growing point. When the terminal bud is nixed, this stimulates dormant buds lower down on the plant to spring into action. Usually, each pinch at least doubles the number of stems, giving a much denser and more attractive plant with more leaves (herbs) and more flowers (annuals). It does slow the plant down a bit, but usually within 5 to 7 days, the seedling will be sprouting new growth.

Traditionally, pinching really is done exactly like the term suggests: by pinching the growing point between the thumb and forefinger. Since the bud is still soft, it comes right off. Of course, you can also cut off the bud with scissors or pruning shears… and that is still considered “pinching”.

Pinching Today

Pinching is still used on more mature plants (shrubs and houseplants notably) to keep them in check, but pinching seedlings is a bit of a dying art. Most modern varieties of annuals and herbs have been selected to be self-branching. Old-fashioned basils and coleus, for example, used to shoot straight for the sky, but many modern varieties begin producing branches almost as soon as they have true leaves. If your seedlings are producing secondary branches, they won’t need pinching. Likewise if the plant’s label suggest it branches well, is self-branching or “needs no pruning”.

That said, there are still older varieties around… and I’ve never seen a cosmos seedling that couldn’t use a pinch or two.

Here is a list of plants that it may be useful to pinch… but even with these plants, do look before you pinch.

  1. Basil
  2. Coleus
  3. Cosmos
  4. Dahlia
  5. Fuchsia
  6. Impatiens
  7. Marigold
  8. Petunia
  9. Snapdragon
  10. Sweet Pea
  11. Zinnia

Larry Hodgson is one of Canada’s best-known garden communicators. He has notably been editor-in-chief of HousePlant Magazine, Fleurs, Plantes et Jardins, À Fleur de Pot and Houseplant Forum magazines and is currently the garden correspondent for Le Soleil and radio garden commentator for CKIA-FM Radio. He has written for many garden publications in both the United States and Canada, including Canadian Gardening, Harrowsmith, Horticulture, Fine Gardening and Organic Gardening. He also speaks frequently to horticultural groups throughout Canada and the U.S. His book credits include The Garden Lover’s Guide to Canada, Complete Guide to Houseplants, Making the Most of Shade, Perennials for Every Purpose, Annuals for Every Purpose, and Houseplants for Dummies, as well as nearly 60 other titles in English and French. He is a past president of the Garden Writers Association (now Garden Communicators International) and the winner of the prestigious 2006 Garden Media Promoter Award offered by the Perennial Plant Association. He resides in Quebec City, Quebec, Canada.

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