Watering schedule

How often to water Common purslane (Portulaca oleracea) — the schedule

Also called common purslane, purslane, verdolaga, pigweed, little hogweed, fatweed.

More about common purslane

Watering at a glance

Base rhythm	When the top 3-5 cm of soil is dry, roughly every 7-14 days
Spring / summer	Spring and summer: soak fully, then leave it alone until the soil is dry all the way down — usually around every 7-14 days.
Autumn	Autumn: ease off as growth slows; stretch the gap noticeably longer than the summer rhythm.
Winter	Winter: water sparingly, roughly once a month or even less in a cool room. The thick leaves carry it through.
Light	Direct sun (at least 4-6 hours)

About Common purslane

Portulaca oleracea · also called common purslane, purslane · edible

Common purslane is a fleshy, prostrate annual valued both as a culinary herb and salad green across Mediterranean, Middle Eastern and Asian cuisines. Its succulent stems and leaves are rich in omega-3 fatty acids, vitamins A and C, and have a mild, slightly lemony flavour. It thrives in poor, dry soil and full sun. The ASPCA lists Portulaca as toxic to pets via soluble oxalates.

Ideal humidity: 30-55%

Watch for — Powdery mildew in humid conditions: Crowded plants in still, humid air can develop powdery mildew — space plants 15-20 cm apart, improve airflow and avoid overhead watering in the evening.

The watering schedule, season by season

Common purslane stores water in its thick leaves and stems, so when in doubt, wait — it survives drought far better than soggy soil. The base rhythm for common purslane is when the top 3-5 cm of soil is dry, roughly every 7-14 days, but the real interval moves with the season, the light and the pot — so treat the figures below as a starting point and always confirm with the plant itself.

Spring & summer (active growth): Spring and summer: soak fully, then leave it alone until the soil is dry all the way down — usually around every 7-14 days.
Autumn (slowing down): Autumn: ease off as growth slows; stretch the gap noticeably longer than the summer rhythm.
Winter (rest / dormancy): Winter: water sparingly, roughly once a month or even less in a cool room. The thick leaves carry it through.

Common purslane is a drought-tolerant succulent that stores water in its thick stems. Overwatering causes root rot and dilutes the flavour of leaves. Allow the soil to dry between waterings. In very hot, dry summers, water more frequently to prevent bolting, but err on the dry side. For edible production, consistent moisture produces more tender leaves.

Want this turned into a live reminder that adjusts to your home and the weather? The Growli watering calculator takes your pot size, light and season and returns a starting interval for common purslane in seconds.

How to tell common purslane needs water

A calendar is the worst way to water common purslane. Check the plant and the soil instead — for this species, look for these signals in order:

The lower or oldest leaves feel slightly soft or look a touch wrinkled.
The pot is noticeably light when lifted.
Soil is dry several centimetres down, not just at the surface.

The most reliable single check is the first one on that list. When two signals agree, water; when they disagree, wait a day and look again — under-watering common purslane for a day is almost always safer than over-watering it.

Overwatering vs underwatering common purslane

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For common purslane specifically:

Signs you are overwatering

Leaves turn translucent, yellow, soft and mushy — classic overwatering.
Lower stem darkens or goes squishy at soil level.
Whole rosettes or sections drop at the lightest touch.

Signs you are underwatering

Leaves pucker, wrinkle or curl inward — a harmless thirst signal that reverses fast after a soak.
Older leaves dry crisp from the tips first.

Overwatering is the number-one killer of common purslane. The thick leaves are a water tank — a slightly thirsty plant recovers in a day; a waterlogged one rots from the roots up.

Water quality notes

Tap water is generally fine for common purslane; the soak-and-dry rhythm matters far more than water type.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For common purslane, the levers that matter most are:

A gritty, free-draining mix is essential — ordinary potting soil holds too much water for this plant.
Terracotta dries faster and is more forgiving than plastic or glazed ceramic.
More light and warmth speed drying, so the interval shortens in peak summer — always check, never assume.

Pot choice is part of this too — work out the right size with the pot size calculator, since a pot that is too big stays wet long enough to rot the roots of common purslane.

Common purslane watering — frequently asked questions

How often should I water common purslane?

Water common purslane when the top 3-5 cm of soil is dry, roughly every 7-14 days. Spring and summer: soak fully, then leave it alone until the soil is dry all the way down — usually around every 7-14 days. Winter: water sparingly, roughly once a month or even less in a cool room. The thick leaves carry it through.

How do I know when common purslane needs water?

The lower or oldest leaves feel slightly soft or look a touch wrinkled. The pot is noticeably light when lifted. Soil is dry several centimetres down, not just at the surface. The single most reliable test for common purslane is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered common purslane look like?

Leaves turn translucent, yellow, soft and mushy — classic overwatering. Lower stem darkens or goes squishy at soil level. Whole rosettes or sections drop at the lightest touch. Overwatering is the number-one killer of common purslane. The thick leaves are a water tank — a slightly thirsty plant recovers in a day; a waterlogged one rots from the roots up.

What are the signs of an underwatered common purslane?

Leaves pucker, wrinkle or curl inward — a harmless thirst signal that reverses fast after a soak. Older leaves dry crisp from the tips first.

Can I use tap water on common purslane?