Perfect Outdoor LST: Shaping a Flat Canopy for Pre-Flower
The setup
Our grower is running a Purple Pomegranate photoperiod hybrid outdoors in a massive 30-to-40 gallon pot filled with coco. On day 56 of vegetative growth, the plant has just started showing its first delicate white pistils (the tiny white hairs that signal the start of bloom), showing a smooth transition into the pre-flower stretch. The weather today is a cool 65 degrees Fahrenheit with a high relative humidity of 76 percent under clear skies.
Instead of letting the plant grow into a tall, Christmas-tree shape, this grower used green plastic-coated wire ties to gently bend and anchor the thick lateral stems to the pot rim. The pot itself sits elevated on concrete blocks in a clean backyard corner, keeping it off the cold ground and allowing excellent airflow underneath.
Why it worked
This is textbook execution of low-stress training (LST). By bending the main branches horizontally, the grower broke apical dominance, which is the plant's natural habit of sending all its growth energy to one central top shoot. Bending the main stem redistributes growth hormones, called auxins, evenly across the entire branch network, pushing all the lower shoots upward to create a flat, table-like canopy where every shoot becomes a main cola.
The choice of a massive 30-to-40 gallon container of coco outdoors is unusual but highly effective here. It provides a massive root zone that cushions against temperature swings. Elevating the pot on concrete blocks prevents the cold ground from chilling the roots, which would otherwise slow down nutrient uptake. Despite the cool, humid air, the leaves show exceptional turgor (water pressure inside the plant cells) and a uniform, lush green color with absolutely zero nutrient burn.
How to replicate it
- To replicate this flawless canopy and transition, follow these steps:
- Start training early when stems are young and pliable (bendy like cooked spaghetti, not stiff like dry twigs).
- Use soft, plastic-coated garden wire or soft ties anchored to the pot rim to pull the tallest branches down and outward.
- Elevate outdoor pots on risers or concrete blocks to keep root zones warm and promote drainage.
- Space branches radially like the spokes of a wheel to ensure every leaf gets maximum direct sunlight.
- Tuck large fan leaves (the big solar panels) under developing bud sites rather than cutting them off, preserving the plant's energy for the upcoming stretch.
Keep it going
- Let the large volume of medium dry down naturally between waterings (wait until the top 3 inches of coco feel bone-dry before watering again).
- Transition the feed from high nitrogen to a balanced pre-flower recipe (aiming for an EC of 1.6-2.0 as the rapid vertical growth begins).
- Keep watering with plain pH-adjusted water (aim for pH 6.2-6.5) when the plant demands it to prevent salt buildup in the large pot.
- Watch the canopy daily during the stretch (the next 2-3 weeks) and adjust training ties to keep the top flat.
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