Growli
Let's go

Watering schedule

How often to water Short-Horned Sundew (Drosera brevicornis) — the schedule

Also called Short-horned sundew, Woolly sundew.

More about short-horned sundew

About Short-Horned Sundew

Drosera brevicornis · also called Short-horned sundew, Woolly sundew · tropical

Drosera brevicornis is a small tropical carnivorous perennial in section Lasiocephala, native to the Northern Territory and far north-west Queensland in Australia, where it grows on gravel slopes, creek banks, and shallow depressions in seasonally wet savanna. Unlike most sundews it has no dormancy period and demands consistently warm temperatures year-round — never let it drop below 20 °C. The petioles and leaf margins are covered in dense silky hairs that help trap moisture in the hot inter-monsoon period; keep humidity high and the soil permanently wet. Drosera is not listed in the ASPCA Toxic and Non-Toxic Plant database, but sundews contain plumbagin; classify as mildly-toxic until an authoritative listing confirms otherwise.

Ideal humidity: 60–90%

Watch for — Crown rot: Caused by poor air circulation combined with standing water touching the crown; ensure airflow around the plant and keep the tray water below crown level.

The watering schedule, season by season

Short-Horned Sundew is a bog plant adapted to nutrient-poor wet ground — it must sit in a tray of pure water and must never get tap water or fertiliser. The base rhythm for short-horned sundew is constantly moist — tray method year-round, 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.

Sit the pot in 1–2 cm of distilled or rain water at all times; never allow the soil to dry out, and always use mineral-free water as this species is particularly sensitive to dissolved salts.

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 short-horned sundew in seconds.

How to tell short-horned sundew needs water

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

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 short-horned sundew for a day is almost always safer than over-watering it.

Overwatering vs underwatering short-horned sundew

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

Signs you are overwatering

Signs you are underwatering

Tap or bottled mineral water kills short-horned sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

Water quality notes

Only rainwater, distilled or reverse-osmosis water — never tap, mineral or softened water. This is the single most important rule for short-horned sundew.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For short-horned sundew, the levers that matter most are:

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 short-horned sundew.

Short-Horned Sundew watering — frequently asked questions

How often should I water short-horned sundew?

Water short-horned sundew constantly moist — tray method year-round. Spring and summer: keep the pot standing in 1-2 cm of distilled or rainwater at all times; top the tray up as it is taken up. Winter: keep just damp, not flooded — many temperate carnivores need a cool dormancy with far less water.

How do I know when short-horned sundew needs water?

The tray has run dry (during active growth it should rarely be empty). The peat-based medium feels dry rather than wet. Traps or pitchers shrivel or fail to form. The single most reliable test for short-horned sundew is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered short-horned sundew look like?

Blackening traps or pitchers from stagnant, warm, mineral-laden water. Rotting crown if kept warm and flooded through winter dormancy. Tap or bottled mineral water kills short-horned sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

What are the signs of an underwatered short-horned sundew?

Traps go limp and brown; pitchers dry up. The medium dries out and the plant collapses quickly.

Can I use tap water on short-horned sundew?

Only rainwater, distilled or reverse-osmosis water — never tap, mineral or softened water. This is the single most important rule for short-horned sundew.

Keep reading