Crassula ovata: a 21-day watering rhythm and why yours never flowers
Jade is sold as a beginner plant and it is one, in the sense that it survives neglect for years. Turning it into a 60 cm specimen with a trunk, and getting it to flower, are two separate and entirely solvable problems.
The 21-day summer rhythm and the 60-day winter one
At 22–26 °C in a 20 cm pot with the gritty mix below, jade dries to the point of needing water in 18–24 days. Water to full saturation, then let it go. The leaves are the gauge: a well-watered jade leaf is rigid enough to snap; a thirsty one flexes slightly and shows a faint crease along the upper surface. Water when the crease appears on the second-lowest pair.
In winter at 10–14 °C, stretch that to 45–60 days. Most indoor jade deaths are winter waterings: the plant is in a rest period, the room is cool, the pot is large and the mix is damp at the base for six weeks. If in doubt between watering and not watering from December to February, do not water.
How to get the trunk
The woody trunk is not a variety — it is a consequence of pruning and light. Jade in 20,000 lux or better puts on a caliper of roughly 4–6 mm per year on the main stem once it is above 30 cm, and pruning accelerates this by forcing branching. Cut the leader at any height you like in late March; the cut point scars over in about three weeks and throws two or three new leaders.
A plant grown at 8,000 lux will still be green and alive at ten years old with a 6 mm stem. That is the whole difference. Direct sun for six hours a day in summer, plus a 20–25 °C night, produces the fastest caliper growth this species is capable of.
Why yours never flowers, and the 8–10 °C trigger
Jade flowers on the previous season's ripened wood and needs a genuine cool, dry rest to initiate buds. The trigger is eight to ten weeks at night temperatures between 8 and 10 °C with no water at all, followed by a return to 18–22 °C and normal watering in early March. Plants kept above 15 °C all winter simply never receive the signal.
The plant must also be at least four years old and have had a full, high-light summer. If you meet all three — age, summer light, cool dry winter — buds appear in the leaf axils in late March and open white-pink in May. If you meet two, you get foliage.
The single-leaf cutting that actually works
Leaf cuttings do work on jade, slowly. Twist a leaf free with the whole petiole attached; if it comes away with a torn base it will not root. Leave it on dry paper in shade for five days until the base calluses to a hard, pale disc.
Set it at a 30-degree angle with the callus just touching the mix. Do not water the leaf — mist the surrounding surface every ten days. Roots at 20–24 °C appear in 30–45 days and the first shoot in 60–90 days. Expect a plant of usable size in about three years, which is why stem cuttings are the practical route.
Parameter table
- Latin name
- Crassula ovata
- Common name
- Jade plant
- Rosette form
- open
- Light range
- 20,000–50,000 lux
- Water interval
- 21 days at 24–28 °C
- Rest period
- Rest period November to February; flowers need 8–10 °C nights in that window
- Hardiness
- 10–11 (frost-tender below 2 °C)
- Offset behaviour
- Rarely offsets; propagated from stem or single-leaf cuttings, and from any fallen leaf that lands on mix
- Soil mix (by volume)
- 1 pumice : 1 akadama : 1 bark fines, by volume
- Mature diameter
- 60 cm
| Month | State | What the plant wants |
|---|---|---|
| January | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| February | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
| March | Growth | Repotting window opens for summer growers. Trim roots, refresh the mineral fraction, dry for a week. |
| April | Growth | Growth restarts. First full watering at the rim, then resume the published interval. |
| May | Growth | Peak growth and the offset season. Feed at quarter strength every third watering. |
| June | Growth | Lengthening days, rising heat. Watch the leaf turgor test rather than the calendar. |
| July | Growth | Hottest weeks. Water in the evening, a third of the spring volume, and only on a visible symptom. |
| August | Growth | Heat eases at night. Prepare mix and pots for the autumn repotting window. |
| September | Growth | Autumn window for winter growers. Root-prune and repot while the soil is still warm. |
| October | Growth | Peak autumn growth. This is the season when most colour work should be done. |
| November | Growth | Daylight falls fast. Taper watering by a quarter and stop feeding entirely. |
| December | Rest | Out of action for this genus — no water unless the plant visibly shrinks, and no repotting. |
Tinted rows are the months this genus is genuinely out of action: no repotting, no feeding, and water only if the plant visibly shrinks.
Four things to take away
- Summer cycle 18–24 days; winter 45–60 days. Water on the leaf crease, not the calendar.
- Trunk thickness is a light-and-pruning outcome, not a variety: 4–6 mm per year above 30 cm.
- Flowering needs eight weeks of 8–10 °C nights with no water at all.
- Leaf cuttings need a whole petiole and a five-day callus; roots in 30–45 days.
Informational only — This page is a cultivation record, not horticultural or plant-pathology advice. Any treatment should follow the product label and local regulation.