Gadenin日本語Get the appWhy the orange year overlaps itself
Most fruit trees run a clean cycle: flower, set, swell, harvest, rest. An orange does not. Its fruit takes the better part of a year to ripen, and in many climates the previous crop is still hanging on the branch when the new flowers open. That single fact explains almost every timing rule in citrus growing, including why you prune in such a narrow window and why late feeding causes trouble.
It also explains biennial bearing. A tree still carrying last year's crop while trying to flower is being asked to do two expensive things at once, and it usually settles the argument by setting a light crop. That produces the familiar pattern of one heavy year and one thin one. Clearing the tree promptly at the end of the picking season is the main way to break the cycle.
The table below sets out the shape of the year. Treat the season names as descriptions of what the tree is doing rather than as fixed months, since the same tree runs several weeks apart in two gardens a mile apart.
| Season | What the tree is doing | Your main jobs |
|---|---|---|
| Late winter to early spring | Last crop finishing, buds swelling | Finish picking, prune, first nitrogen feed |
| Spring | First flush, then flowering | Water steadily, check for scale, remove suckers |
| Early summer | Natural fruit drop, fruitlets swelling | Even water, second and third feeds, mulch |
| Mid to late summer | Fruit sizing, second flush | Deep infrequent water, watch leaf miner |
| Autumn | Color and sugar developing | Stop nitrogen, taper water, protect from wind |
| Winter | Ripening slowly, growth stalled | Frost protection, taste tests, minimal water |
Late winter and early spring: the only real pruning window
Clear the last of the crop as soon as it is genuinely ready. Fruit left hanging into flowering competes with the new crop and is the direct cause of an off year, so this is not a job to drift on. Taste rather than look, and finish the tree over a few weeks rather than all at once.
With the fruit off and before growth restarts, prune. Take out rootstock suckers, dead and damaged wood, crossing branches, and lift the skirt clear of the ground; thin the center lightly if it has closed up. Keep it modest, well under a fifth of the canopy, and paint any newly exposed major limb with diluted white paint to prevent sunburn.
Give the first nitrogen feed as buds start to move, and scrape the soil back from the base of the trunk to check that the graft union is still standing clear. Beds settle and mulch creeps. This is the once-a-year look that catches it while it is still a five minute fix.
Spring and early summer: flowering, set and drop
The first flush of new growth comes before or with the flowers, and it is where most of next year's fruiting wood is being made. Water steadily through flowering and the weeks that follow; a dry spell now removes fruitlets wholesale, and no amount of later care replaces them. Do not let the tree swing between saturated and bone dry.
Expect a heavy natural drop of pea to marble sized fruit a few weeks after flowering. This is the tree matching its crop to its resources and is a sign of health, not a failure. Leave it to happen and do not respond by feeding more.
Start checking for scale seriously now. New flush and flowering coincide with the crawler stage, which is the only time scale insects move and the point at which treatment is most effective. Look at leaf undersides and twig junctions, and watch for ants on the trunk as an early tell. Feed again around flowering, and mulch out to the canopy edge while the soil still holds spring moisture, keeping the mulch pulled well back from the trunk.
Summer, autumn and winter: sizing, sugar and cold
Through summer the fruit sizes and the tree pushes a second flush. Water deeply and less often to keep the roots down, and give a further nitrogen feed early in the season if the tree is carrying a heavy crop. Watch for leaf miner on the new growth and leave the affected leaves alone; the damage looks far worse than it is.
In autumn, stop nitrogen. Late feeding pushes a soft flush that will not harden before cold arrives and that draws leaf miner at its worst point in the year. Taper the water somewhat, but keep it even: sharp swings during the final swell are what split the skins of nearly ready fruit. If your nights are cooling, this is when the peel begins to change color, and it is worth remembering that where nights stay warm a fully ripe fruit will simply stay green.
Winter is mostly about not losing what you have. Water sparingly, because cold wet soil is far more dangerous than dry soil at this point. Protect against frost when it threatens: a covering over the canopy on still cold nights, a thick mulch over the root zone, and water in the soil the day before, since damp soil holds and releases more warmth than dry soil. Start taste testing rather than watching for color, taking a single fruit from the sunniest side of the tree every two or three weeks.
Fruit will take frost damage before the tree does. A night that only nips the leaf tips can still turn the flesh dry and separated inside the fruit, and there is no way to see it from the outside. After a hard frost, cut one fruit open before you decide the crop came through unharmed.
The five records that run the tree
Keep five dates each year and you will know more about your tree than any general guide can tell you: the date of the first spring flush, the date the first flowers opened, the week of the natural fruit drop, the date of your first successful taste test, and the date you cleared the last fruit. Everything else in the year hangs off those five.
Add the position of the tree measured from two fixed points, and the rootstock if you know it, because both become impossible to recover once the label is gone. Note the feeding dates as you go rather than reconstructing them later, and log where you removed suckers and where scale appeared. Within two or three seasons this turns into a calendar built from your own garden, and it will beat any generic schedule you can find.