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In my class we learned to repot at 70% root coverage however as I am mostly interested in bonsai style planting I'm confused about this rule. If I am attempting to limit my plant to a certain height is there any reason I would need to repot and would I have to continuously have to get bigger pots for the same sized plant ?

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    I have a degree in Horticulture and I've never heard of this "rule". How are you supposed to determine when a plant is at 70% root coverage? By depotting it and taking a look? That's bad for most plants. It seems like there are a ton of gardening rules, but they're all really "guidelines" and some only apply to specific plants.
    – Jurp
    Commented Dec 11, 2023 at 2:05
  • Root-bound plants flower for being slightly frightened by their limited territory. Good. Plants can be left in old pots until they scream for help. Bonsai small-pot-root-cramping is intrinsic to the dwarfing. Commented Dec 11, 2023 at 18:43

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As mentioned by @Jurp, I have never heard of this either. Often people make up their own rules of thumbs and then they take off.

If you are interested in Bonsai-ing, then the last thing you want to do is to repot the plant.

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  • IIRC (not really tilting at Bonsai personally) one might de-pot, root prune, and re-pot in the same pot some times. That's a bonsai only technique AFAIK
    – Ecnerwal
    Commented Dec 11, 2023 at 17:04

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