Yoyo Plant Supports
Retractable spring-loaded clips that hold up heavy cannabis branches without tying knots or rebuilding trellis netting every cycle.
Yoyos are one of the few grow-shop gadgets that earn their shelf space. They're cheap, reusable, and solve a real problem: heavy colas falling over in week 6 of flower. They won't increase yield on their own — they prevent yield loss from snapped branches and light burn. If you already run a sturdy ScrOG or stake every plant, yoyos are redundant. If you don't, a $15 pack will save you a panicked midnight bamboo-and-tape rescue.
What a yoyo support actually is
A yoyo support is a small plastic spool containing a retractable line — usually nylon or polypropylene — with a hook or clip on the free end. The spool houses a constant-tension spring, so the line pays out under load and retracts when slack. You anchor the spool overhead, pull the line down, and clip it to a branch. The spring keeps gentle upward tension as the plant grows.
They were originally marketed to tomato and pepper growers under brand names like Tomato Hooks and Hortinova Rollerhooks, and have been used in commercial greenhouse production for decades [1][2]. Cannabis growers adopted them for the same reason: indeterminate, top-heavy plants with fragile lateral branches.
Why growers use them
Cannabis flowers get heavy. A well-fed plant in late flower can put a kilo of wet bud weight onto branches that started the season as pencil-thick stems. Without support, three things happen:
- Branches snap or split at the crotch. A split main branch in week 7 is a salvage operation, not a fix.
- Colas lean into the light. Tops resting against an HPS or close-hung LED bleach white and lose terpene content Strong evidence[3].
- Canopy collapses inward. Lower bud sites get shaded, airflow drops, and humidity pockets form — a setup for Botrytis (Bud Rot) Strong evidence[4].
Yoyos solve all three by lifting branches outward and upward without the labor of tying individual stakes. Compared to bamboo stakes, they're faster to deploy, don't puncture roots, and adjust as the plant grows. Compared to trellis netting (ScrOG), they're less commitment and don't lock you into a fixed canopy shape Anecdote.
When to start
There's no fixed week. Start when a branch's tip starts drooping below horizontal under its own weight, or when you can see a branch will clearly need help within 7–10 days. For most photoperiod indoor grows that's somewhere between the stretch phase (flower weeks 1–3) and early bulking (weeks 4–5).
Don't install them too early. Yoyos on a plant that doesn't need them yet just clutter the canopy and get in the way of defoliation and watering. You can always add more later — that's the point of having a reusable, retractable system.
How to install yoyos, step by step
1. Set up anchor points. You need something rigid overhead: a tent frame crossbar, a length of EMT conduit run between tent poles, eye hooks in a grow room ceiling, or the top bar of a trellis frame. The anchor must hold the weight of a wet flowering branch (assume 0.5–1.5 kg per yoyo) without flexing.
2. Hang the spool. Most yoyos have an S-hook or built-in hanger on the spool body. Clip it to your anchor directly above the branch you want to support. Avoid hanging it off-center — sideways pull can drag the cola into neighbors.
3. Pull the line down and clip the branch. Grip the hook end and pull steadily. The spring will resist; that's normal. Clip the hook around the branch about 4–8 inches below the cola tip, on the woody portion — not on the flower itself.
4. Let the spring take tension. Release slowly. The line should pull the branch up to roughly vertical or slightly past. You're not trying to yank it — just to take the load off the crotch.
5. Re-tension weekly. As the plant grows, the branch moves up and the spool retracts line. Check that the clip hasn't slipped down into a flower or girdled the stem. Reposition if needed.
6. Remove at harvest. Unclip, let the line retract fully into the spool, wipe off resin with isopropyl alcohol, and store. A decent yoyo will last 5+ cycles Anecdote.
Common mistakes
- Clipping onto the flower itself. The hook will crush trichomes and bruise the bud. Always clip onto stem, below the lowest flower on that branch.
- Anchoring to flimsy supports. Tent fabric, light cords, and ducting are not anchors. The spool will pull them down or, worse, drag your light into the canopy.
- Using too few. One yoyo per main cola is the usual ratio for a topped plant. A single yoyo on a 6-branch plant just pulls the center up and lets the outside flop.
- Leaving them on at harvest. Cutting a plant down with yoyos still attached is a tangled mess. Unclip first.
- Buying the cheapest ones. Bargain yoyos lose spring tension fast. Mid-tier horticultural-grade units (the kind sold to commercial tomato greenhouses) hold up much better Anecdote.
Related techniques
Yoyos sit in the same toolkit as other plant-training and support methods, but they're a complement, not a replacement:
- Low-Stress Training (LST) shapes the canopy during veg using soft ties. Yoyos hold the result up during flower.
- ScrOG (Screen of Green) uses a horizontal net to spread and support canopy. Some growers run ScrOG plus yoyos for extra-heavy strains.
- Bamboo stakes do the same job as yoyos but are slower to install and can damage roots. Better for outdoor or single large plants.
- Soft plant ties / Velcro tape are useful for lashing branches to existing structures when an overhead anchor isn't available.
None of these techniques increase potency or yield on their own — they preserve yield the plant has already grown. If your plants never tip over, you don't need any of them.
Sources
- Peer-reviewed Heuvelink, E. (Ed.). (2018). Tomatoes (2nd ed.). CABI. Chapter on training and pruning systems in greenhouse tomato production.
- Government University of Massachusetts Extension. Greenhouse Tomato Production Practices — Trellising and Support Systems.
- Peer-reviewed Rodriguez-Morrison, V., Llewellyn, D., & Zheng, Y. (2021). Cannabis Yield, Potency, and Leaf Photosynthesis Respond Differently to Increasing Light Levels in an Indoor Environment. Frontiers in Plant Science, 12, 646020.
- Peer-reviewed Punja, Z. K. (2021). Emerging diseases of Cannabis sativa and sustainable management. Pest Management Science, 77(9), 3857–3870.
- Government Oregon State University Extension. Cannabis Production: Plant Training and Canopy Management.
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Related
- Low-Stress Training (LST) — A gentle plant training technique that uses bending and tying to flatten the canopy and ex...