Bonsai care calendar
Bonsai care is a calendar, not a checklist. Almost every job on a tree — repotting, feeding, the shaping cuts, getting it through winter — belongs to a season, and doing the right thing in the wrong month is how beginners lose trees. This works out what your tree needs in the month you pick, and when its next repotting window opens. It won’t tell you when to water: that one is never on a calendar.
Why a calendar, when watering isn’t on one
Those two rules look contradictory and aren’t. Watering answers to the weather, which changes hour to hour, so a fixed watering day is guaranteed to be wrong most weeks — you check the soil and let it decide. Everything else answers to the tree’s own year, which is slow and predictable: roots are disturbed while the tree is about to push growth, feeding follows the growing season, hard cuts wait for the right window, and a hardy tree needs its cold months. That part genuinely is a calendar, and it’s the part beginners are usually never told.
Repotting is the clearest case. It is not a response to a tree looking pot-bound in August — it’s an early-spring job, and this tool will never say “repot now” in any other month, however overdue the tree is. Waiting until spring is the correct answer even when the answer is annoying.
Where this comes from
The month’s jobs are the seasonal table in our own guide, how to care for a bonsai tree: spring for repotting, fresh growth, the first feed and structural work; summer for frequent watering, maintenance pruning and pinching; autumn to ease off feeding and prepare hardy trees for winter; winter for dormancy, minimal water and cold protection. The indoor-versus-outdoor split is the same guide’s rule that tropical species can live indoors by a bright window while temperate species must stay outside year-round.
The repotting cadence is the guide’s 2–3 years for most young trees, less for older ones. Because it names no number for older trees, neither does this — that answer comes back as “keep your own record” rather than an invented interval. Two things here are our estimate, not the guide’s: which calendar months map to which season, and that early spring means March in the northern hemisphere and September in the southern. Your local spring may run a few weeks either side, and the tree is the better signal than the date.
If you’re not sure, do less
The errors in bonsai care are not symmetrical. Skipping a feed costs the tree a little growth you’ll get back next season. Repotting in the wrong month, cutting a branch you can’t put back, or bringing an outdoor tree in to “protect” it from a winter it needs — those can cost the tree. So where this tool is uncertain it points at waiting and recording rather than acting, and the beginner version of every shaping job is the light version.
- How to care for a bonsai tree — light, soil, pruning and the seasonal rhythm in full
- Bonsai watering calculator — the one job this calendar leaves out, worked out as a check-in rhythm
- How often to water a bonsai tree — the finger test, and why the seven-day rule kills trees
- Growing succulents too? The succulent watering calculator and the light checker work the same way
A calendar tells you the month. A record tells you the tree.
This page can’t know when you last repotted, which fertiliser the tree liked, or how it took last summer’s heat — and over a bonsai’s life that record is worth more than any single tip. Bonsai keeps a per-tree care calendar for watering, feeding, pruning, repotting and wiring, with season-aware reminders instead of a fixed timer, plus a photo timeline you can swipe through by season. On your device, no account.
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