Watering schedule

How often to water Cobweb Spiderwort (Cyanotis arachnoidea) — the schedule

Also called Cobweb Spiderwort, White Grass of the Dew, Grass of the Dew.

More about cobweb spiderwort

Watering at a glance

Base rhythm	Every 4–6 days in summer; every 10–14 days in winter
Spring / summer	Spring and summer: water when the top of the soil is dry to roughly a knuckle deep — typically every 4–6 days.
Autumn	Autumn: growth slows, so stretch the interval and let it dry a little more between waterings.
Winter	Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.
Light	Bright indirect light (just back from a sunny window)

About Cobweb Spiderwort

Cyanotis arachnoidea · also called Cobweb Spiderwort, White Grass of the Dew · houseplant

Cyanotis arachnoidea is a creeping, softly hairy perennial from tropical Africa and Asia, bearing cobalt-blue or pink three-petalled flowers. Its prostrate stems root freely at nodes, making it an excellent groundcover or trailing basket plant. It needs bright light, well-draining soil, and warm, humid conditions.

Ideal humidity: 50–70%

Watch for — Root and stem rot: Overwatering or poor drainage causes soft, blackened stems at the base. Always use pots with drainage holes and allow the surface of the soil to dry slightly between waterings.

The watering schedule, season by season

Cobweb Spiderwort likes a soak-then-partly-dry rhythm — let the top of the soil dry before watering again, and never leave it standing in water. The base rhythm for cobweb spiderwort is every 4–6 days in summer; every 10–14 days in winter, 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: water when the top of the soil is dry to roughly a knuckle deep — typically every 4–6 days.
Autumn (slowing down): Autumn: growth slows, so stretch the interval and let it dry a little more between waterings.
Winter (rest / dormancy): Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.

Keep soil consistently moist but never waterlogged. Water from the base where possible to keep the hairy foliage dry and prevent fungal issues. Reduce in winter but do not allow the root ball to fully dry out.

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 cobweb spiderwort in seconds.

How to tell cobweb spiderwort needs water

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

The top 2-3 cm of soil is dry to the touch (or a knuckle-deep finger test comes back dry).
Lifting the pot, it feels distinctly light.
Leaves droop slightly or lose a little of their gloss just before they truly need water.

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 cobweb spiderwort for a day is almost always safer than over-watering it.

Overwatering vs underwatering cobweb spiderwort

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

Signs you are overwatering

Yellowing lower leaves and a pot that stays wet and heavy for days.
Soft, brown, mushy stems or a sour soil smell — root rot.
Fungus gnats breeding in permanently damp soil.

Signs you are underwatering

Drooping, curling leaves with crispy brown edges that perk up after watering.
The rootball shrinks away from the pot and water runs straight down the sides.
Slow growth and a generally tired, washed-out look.

Watering cobweb spiderwort on a fixed weekly calendar regardless of season is the most common mistake — in dim winter light the same routine drowns it. Check the soil, not the date.

Water quality notes

Tap water is generally fine for cobweb spiderwort. If your water is very hard and you see brown leaf tips, switch to filtered or rainwater.

Seasonal and environmental adjusters

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

More light and warmth speed drying; the brighter the spot, the shorter the real interval.
Pot size and material matter — small terracotta pots dry far faster than large glazed or plastic ones.
Lifting the pot to feel its weight is more reliable than any calendar for judging when to water.

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 cobweb spiderwort.

Cobweb Spiderwort watering — frequently asked questions

How often should I water cobweb spiderwort?

Water cobweb spiderwort every 4–6 days in summer; every 10–14 days in winter. Spring and summer: water when the top of the soil is dry to roughly a knuckle deep — typically every 4–6 days. Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.

How do I know when cobweb spiderwort needs water?

The top 2-3 cm of soil is dry to the touch (or a knuckle-deep finger test comes back dry). Lifting the pot, it feels distinctly light. Leaves droop slightly or lose a little of their gloss just before they truly need water. The single most reliable test for cobweb spiderwort is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered cobweb spiderwort look like?

Yellowing lower leaves and a pot that stays wet and heavy for days. Soft, brown, mushy stems or a sour soil smell — root rot. Fungus gnats breeding in permanently damp soil. Watering cobweb spiderwort on a fixed weekly calendar regardless of season is the most common mistake — in dim winter light the same routine drowns it. Check the soil, not the date.

What are the signs of an underwatered cobweb spiderwort?

Drooping, curling leaves with crispy brown edges that perk up after watering. The rootball shrinks away from the pot and water runs straight down the sides. Slow growth and a generally tired, washed-out look.

Can I use tap water on cobweb spiderwort?