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Pruning & pinching

A pair of pruners does more for yield than any fertilizer. The right cut sends energy where you want it — to fruit instead of foliage, to new growth instead of tired old stems — and keeps airflow moving through the bed so disease can't settle in. Most SFG cuts are small and frequent, not big annual jobs.

Why prune?

  • More and bigger fruit — removing leafy suckers channels sugar into the flowering shoots.
  • Better airflow and light — dense foliage is where mildew and blight start. A thinned plant dries faster after rain.
  • Bushier, longer-living herbs — pinching tops forces side shoots; plants that are never cut bolt to seed in weeks.
  • Easier harvest — staked, pruned tomatoes can be picked without hunting through a jungle.

    • When to prune

  • Light jobs (pinching, deadheading, suckering) anytime during the growing season — ideally weekly.
  • Hard prunes (cutting back perennial herbs, berry canes) in late winter / early spring before buds swell.
  • Never prune in pouring rain or heavy dew — wet wounds invite bacterial and fungal disease.
  • Stop pruning tomatoes and other fruiting plants 4–6 weeks before the first frost — let existing fruit ripen instead of pushing new growth that won't mature.

    • Tools

    Bypass pruners

    Two curved blades cross like scissors — makes a clean cut that heals fast. The one essential tool. Avoid anvil pruners for live stems (they crush).

    Needle-nose snips / micro-tip scissors

    For precision work in tight spots: pinching basil tips, snipping spent flowers, harvesting herbs. Much better than full-size pruners for delicate cuts.

    Fingers & thumbnail

    Best tool for tomato suckers and soft basil tips while they're still small and snap off cleanly. Zero transmission risk if you wash your hands between plants.

    Tool hygiene

    Wipe blades with 70% alcohol or a 1:10 bleach solution between plants, especially tomatoes and peppers. A single dirty cut can spread virus through the whole bed.

    What to prune in an SFG

    The main SFG candidates for routine pruning:

    Tomatoes (indeterminate)

    Pinch out side shoots (suckers) in every leaf axil when they're 3–5 cm long — between main stem and leaf, a small shoot emerges. Keep one main stem (or two max). Remove the bottom leaves once the plant is 40 cm tall, and any yellowing leaves after that. Determinate / bush varieties: do NOT sucker — you'd remove the fruit.

    Basil

    Pinch the top pair of leaves off every stem once the plant has 4–6 leaf pairs. Keep doing it every 2 weeks. Never let it flower — flowering triggers bitterness and end of growth. A well-pinched plant doubles in size every fortnight.

    Perennial herbs (mint, oregano, thyme, sage)

    Cut back by one-third after flowering to prevent woodiness. A hard prune to 10–15 cm in early spring rejuvenates old plants. Never cut into bare woody stems — cut into leafy growth only.

    Strawberries

    Remove runners during fruiting if you want bigger berries (runners steal energy from fruit). After harvest, cut off old leaves at 5 cm and let fresh leaves grow in — this reduces overwintering disease.

    Berries (raspberry, blueberry, currant)

    Raspberry: cut floricanes (canes that fruited) to the ground after harvest; keep primocanes for next year. Blueberry & currant: remove the oldest 20% of wood each winter to keep the bush productive.

    Flowers (marigold, zinnia, cosmos)

    Deadhead weekly — snip spent blooms just above the next leaf pair. This prevents seed set and keeps the plant flowering for months instead of weeks.

    How to make a good cut

  • Cut on a 45° angle, 0.5 cm above an outward-facing bud or leaf node — water runs off, and new growth goes outward, not inward.
  • Make one clean cut — don't saw back and forth. Sharp blades = clean wound = fast healing.
  • Cut into green, leafy wood on soft plants; cut into old wood on dormant woody shrubs.
  • Remove dead, diseased and damaged wood first — always. The 3 D's before any shaping cuts.
  • Step back every few cuts and look at the overall shape. Prune less than you think — you can always cut more, but you can't glue a branch back on.

    • Common mistakes

  • Pruning determinate (bush) tomatoes like indeterminates — you'll remove most of the fruit.
  • Cutting woody herbs back into bare wood — rosemary, lavender and thyme often won't regrow from old wood.
  • Leaving stubs (cutting too far from the bud) — stubs die back and rot, inviting disease.
  • Pruning stone fruit or perennials in autumn — wounds can't heal before frost. Prune in late winter instead.

    • In doubt? Pinch, don't prune. A fingernail pinch on a 3 cm sucker heals in an hour. A pruner cut on a 3 cm-thick branch takes weeks. Catch it early and everything gets easier.