Gadenin日本語Get the appA tree with no off season
Buddha's hand flowers in flushes rather than in one burst, and in a warm greenhouse it will do this two or three times a year. That means it is normal to be looking at open flowers, green pea-sized fruitlets and near-ripe hands on the same branch at the same time. There is no month when the tree is idle and no month when you can stop watching it.
Practically, this rules out the block routines that work for a deciduous fruit tree. You do not prune once in winter and feed once in spring. You do a small amount of everything every few weeks, all year, adjusting for temperature. The tree tells you which mode it is in: new pale growth means it is feeding and drinking, hard dark leaves and no extension means it has slowed and needs much less of both.
Watering: lift the pot, do not poke the soil
Surface soil tells you nothing in a gritty citrus mix, because the top inch dries within hours while the base is still saturated. Learn the weight of the pot instead. Water heavily until it runs freely from the drainage holes, then tip the pot slightly with your foot every couple of days. When it lifts noticeably more easily than it did straight after watering, water again. Most people, most of the year, are overwatering.
Water quality matters more than for other citrus because you eat the rind and the pith whole rather than paring them away. Hard water pushes the mix alkaline and shows up as yellowing between the leaf veins within a season. If your water is hard, collect rainwater for this one tree, or acidify tap water slightly.
| Conditions | Rough interval | How to confirm | Warning sign |
|---|---|---|---|
| Hot summer outdoors, over 80F (27C) | Every 1-2 days | Pot noticeably light by mid morning | Leaves curl inward along the midrib |
| Mild growing weather, 60-75F (16-24C) | Every 3-5 days | Pot light, top 2 in (5 cm) dry | Fingers stop lengthening |
| Under cover in autumn, 50-60F (10-16C) | Every 7-12 days | Pot still heavy at day 7 | Lower leaves yellow and drop |
| Cold spell under cover, below 50F (10C) | Every 2-4 weeks, sparingly | Only when the pot is clearly light | Soft brown roots, sour smell at the base |
Water in the morning, and pour onto the compost rather than over the fruit. Water sitting in the crease between two fingers overnight is where rind rots start in a still greenhouse.
Feeding a tree that is nearly always cropping
Because there is no dormant block, feeding is close to continuous during the growing half of the year. Use a citrus-specific liquid feed at roughly half the stated strength every ten to fourteen days while the tree is in growth, rather than a full-strength dose once a month. A gritty free-draining mix flushes nutrients through fast, so little and often actually reaches the roots.
Watch for the two deficiencies that always turn up in container citron. Yellowing between green veins on new leaves is iron, usually caused by an alkaline mix rather than an absence of iron, so correct the water before you reach for a chelate. Uniform pale yellowing of older leaves is nitrogen, and a couple of half-strength feeds a fortnight apart will green it up.
Cut feeding right back once night temperatures under cover fall below about 55F (13C). Feeding a tree that has stopped growing simply loads salts into the mix, and those salts will scorch root tips over a long cool winter.
Supporting the fruit before it does damage
A full-sized hand can weigh a pound and a half (700 g) and hangs at the end of thin current-season wood. Left alone, the branch bends until the fruit rests on a lower branch, on the pot rim or on the ground, and every point of contact marks the rind. Worse, individual fingers snap off where they join the base of the fruit if the branch swings. Get ahead of it: support the branch before the fruit is heavy, not after it starts to droop.
- Identify carrying branches early As soon as a fruitlet passes about two inches (5 cm) across, trace the branch back and decide how it will be held. There is no time pressure yet, and it is far easier to tie a branch while it is still upright than to lift a bending one later.
- Tie the branch, never the fruit Run soft wide tape or old cloth from the branch, above the fruit, up to a cane or an overhead wire. Loop it loosely so the branch can still flex. Never pass anything around the fruit stalk itself; the stalk is brittle and a tie there will cut in.
- Give each hand its own airspace Look at every developing fruit from two directions and check that nothing is within a hand's width of it. Where two fruit will grow into each other, remove the smaller one now. Where a fruit will meet a stem, tie the stem aside.
- Cushion the unavoidable contacts If a hand is going to rest against a cane whatever you do, wrap that section of cane in cloth. A padded contact leaves no mark; a bare one leaves a permanent flattened brown stripe.
- Re-check ties every two to three weeks Fruit gains weight quickly in warm weather and branches sag further than you expect. A tie that was correct a fortnight ago may now be letting the hand touch the branch below.
Handling, thorns and the record worth keeping
Handle the fruit as little as you can. Rind that is squeezed or gripped hard shows a dull bruise a few days later, and unlike a lemon there is nothing underneath to fall back on. When you must move a branch aside, hold the wood, not the hand. Wear thick gloves and long sleeves: citron carries stiff thorns up to two inches (5 cm) long in the leaf axils, and the ones that catch you are always the ones behind the fruit you were reaching past.
Rub off any shoot that appears below the graft union as soon as you see it, using your thumb while it is soft. Rootstock suckers grow faster than the fruiting wood and will quietly take over the tree within two seasons if you tolerate them.
Keep a simple log for each fruit you intend to carry through: the date it set, its position on the tree, and the date you supported the branch. At the end of the season you will be able to see which parts of the canopy actually ripened clean fruit and which produced marked ones, and that tells you where to prune and where to hang your supports next year.