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A houseleek grows hardest in the mild halves of the year and idles through both extremes. It puts on new leaves and makes offsets in spring, slows and sits tight through the hottest weeks, has a second surge of growth and its best color in autumn, and then stops almost completely through winter while staying fully alive under frost and snow.
Because the plant lives outdoors, the triggers are weather rather than dates. Growth restarts when nights stop freezing consistently, pauses when days settle above about 86F (30C), and picks up again when the nights first turn cool in late summer. Watch for those three transitions and the schedule below arranges itself.
| Season | What the plant is doing | Water | Main jobs |
|---|---|---|---|
| Early spring | Restarting, new leaves at the center | First soak of the year once dry through | Uncover, tidy dead leaves, repot, split offsets |
| Late spring | Growing strongly, stolons running | Soak every 10 to 14 days in pots | Take and pot offsets, top up grit |
| High summer | Resting through the heat, color fading | A drink every 2 to 3 weeks, evenings only | Leave alone, check for vine weevil |
| Autumn | Second growth surge, color deepening | Soak when dry, then taper off | Last window for repotting and offsets, apply nematodes |
| Winter | Dormant, fully hardy, tightly closed | None at all | Keep rain off, tilt pots, clear fallen leaves |
Spring: the main working window
As soon as hard frosts stop being nightly, take off any winter cover and let the plants have full weather again. Pull away the ring of dry brown leaves at the base of each rosette, which comes off with a light tug, and clear anything that has blown into the pans over winter. This matters more than it sounds, since a mat of wet dead leaves against the rosettes is where spring rot starts.
Wait for a new leaf at the center of the rosettes before the first watering, whatever the weather is doing. Once growth is clearly under way, this is the best window of the year for anything that disturbs roots: repotting pans whose mix has compacted, splitting overcrowded colonies, and moving offsets into new containers. Do not feed. Move any plant that spent the winter in a shaded position into full sun over a fortnight rather than in a single step.
Summer: leave it alone
The summer job list is short on purpose. Once sustained heat arrives, growth stops, the rosettes close up and the color often fades to green. Stretch watering to once every two or three weeks and give it in the evening. Do not repot, do not split colonies, and do not take offsets, because a disturbed root system in that heat sits and rots rather than establishing.
The one thing worth doing is inspection. This is when vine weevil grubs build up unnoticed in containers, so once a month give each rosette a gentle sideways nudge with a finger. Anything that moves freely is being eaten from below and needs the pan tipped out that day. Shriveling of the lowest ring of leaves through summer is normal and is not a signal to water more.
In climates with sustained days above 95F (35C), light afternoon shade prevents scorch on the widest-leaved forms. Keep the morning sun in every case, since that is where the plant does most of its work.
Autumn and winter: color, then cover
Autumn is the second working window and often the better of the two. Cooling nights, strong low sun and a dry root run bring out the deepest reds and purples of the year. Resume normal watering once the heat breaks, take and pot any offsets you want, and finish any repotting early enough that the new plants have six weeks of mild weather to root. This is also the right moment to water parasitic nematodes into containers as a preventive against vine weevil, while the mix is still above 41F (5C).
Then stop. From mid-autumn onwards the aim is to get the plants as dry as possible and keep them there. Cut off watering entirely, tilt pans so rain runs out of the rosettes rather than pooling in them, lift containers onto feet, and clear fallen leaves off the colonies whenever they collect. In a wet mild winter, put an open-sided pane or cover over the best pans, leaving the sides fully open to the air.
Do not bring plants indoors and do not wrap them. Frost and snow do no harm at all to a dry houseleek, and a plant under snow is better protected than one on a warm windowsill. The rosettes will close up tightly and may go dull or purple-bronze for the winter. Both are normal, and both reverse in spring.
Four dates worth writing down
The schedule above is a general shape and your own site will shift it by weeks in either direction. Four dates a year turn it into something specific. Note when you took the winter cover off, when the first new center leaf appeared, when you stretched watering for the summer heat, and when you stopped watering for the winter.
Alongside those, keep a note of which rosettes started stretching for flowering and where they were, and the date of any repotting on a label in the pan. That is a couple of dozen entries a year. Read back over them after a season and the useful pattern usually turns out to be the same one: everything went better in the years the winter cover went on early and the first spring watering went on late.