Gadenin日本語Get the appWater follows growth, and growth is not in summer
The single rule that governs everything here is that an aeonium takes up water only while it is growing, and it grows through autumn, winter and spring. Through those months it is thirstier than most succulents, with a fine surface root system and thin leaves that hold far less reserve than a thick-leaved echeveria or agave. Left bone dry for a month in mid-winter it will visibly shrink, curl its leaves inward and drop the outer ring.
Through the hottest weeks the situation reverses completely. The roots go inactive, the rosettes close into tight buds, and water poured into the pot simply sits there. Wet mix around dormant roots at high temperatures is the classic way to lose an aeonium, and it happens quickly, usually within a fortnight of the owner deciding the closed rosettes looked thirsty.
Through the year
Use the plant, not the calendar. Open flat rosettes and a firm growing point mean the plant is working and can take water. Closed, bud-like rosettes and shedding lower leaves mean it is resting and must be kept mostly dry. The table below is the usual shape of a year for a plant in a container that drains freely.
| Season | State of the plant | Watering | Watch for |
|---|---|---|---|
| Autumn | Waking up, rosettes opening again | Resume with one full soak, then every 7 to 10 days once dry | New leaves unfurling at the center |
| Winter | Main growing season | Soak thoroughly whenever the mix is dry through, often every 7 to 14 days | Leaves plump and rosettes widening |
| Spring | Still growing hard, sometimes flowering | Soak every 7 to 10 days, more in warm dry spells | A rosette stretching upward into a flower spike |
| Early summer | Slowing, rosettes beginning to close | Stretch to every 3 weeks and reduce the amount | Lower leaves going papery, which is normal |
| High summer | Fully at rest, rosettes tight buds | A small drink once a month at most, or none in the ground | Any softness at the base of a stem |
How to give it, when you do give it
In the growing season, water properly rather than in sips. Pour at the surface of the mix around the edge of the pot until water runs freely from the drainage holes, then stop and let the pot drain completely before it goes back on its tray. Small frequent splashes keep the top inch damp and the lower root ball permanently dry, which encourages roots to stay shallow and makes a top-heavy plant even less stable.
Water the mix, not the rosette. The tightly packed center holds droplets and dries slowly in cool weather, and water sitting there through a cold still night is the exact mechanism behind crown rot. If a plant does catch a soaking from overhead or from rain, tilt the pot so the water runs out of the rosettes and put it somewhere with moving air.
Timing within the day matters at the extremes. In cool weather water in the morning so the plant dries before nightfall. In hot weather water in the evening so it is not lost within the hour. Never leave a pot standing in a saucer of run-off, indoors or out, at any time of year.
Reading a thirsty plant against a drowning one
Thirst is slow, visible and easy to correct. The leaves lose their flat firmness and curl inward and downward, the rosette closes partway, and the whole plant feels slightly leathery. Deep watering restores it within a couple of days and there is no lasting damage. The one caveat is that in high summer these same signs are the plant resting, not asking for a drink, and the difference is the season plus whether new growth was visible beforehand.
Overwatering does not look like wilting. It shows at the base of the stem, which goes soft, darker and slightly sunken, and often smells sour if you press it. Leaves fall in numbers from anywhere on the plant rather than only from the lowest ring, and they come away wet at the join rather than dry and papery. There is no saving a rotted stem, but you can usually save the plant by cutting the head off well above the damage, into clean firm tissue, and rerooting it.
One thing that misleads nearly everybody: an aeonium sheds its lowest ring of leaves continuously, all year, and dumps a large number of them at the start of the summer rest. Dry, thin, papery leaves that pull away cleanly from the bottom of a rosette are the plant behaving normally, not a watering fault to be corrected.
If you are unsure whether a summer plant needs water, look at the stem rather than the leaves. A firm stem means wait. A wrinkled stem that gives slightly under a fingertip means give a small drink, about a quarter of what you would give in winter.
The two dates worth recording
Because the answer is so often nothing at all, a full watering log is not the useful record here. What matters is the two turning points: the date you last watered normally before the summer rest, and the date you resumed in autumn. Those two entries, kept for a single year, are enough to stop the mid-summer impulse to rescue a plant that is simply asleep.
Alongside them, note the date the rosettes visibly closed and the date they visibly reopened. Compare those against the weather and you will find your own local trigger, usually the first week of sustained days above about 86F (30C) at one end and the first cool nights at the other. Next year you can start tapering before the plant closes rather than a fortnight after.