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Watering schedule

How often to water Lance-leaved Sundew (Drosera adelae) — the schedule

Also called Lance-leaved sundew, Lance-leaf sundew, Sword sundew.

More about lance-leaved sundew

About Lance-leaved Sundew

Drosera adelae · also called Lance-leaved sundew, Lance-leaf sundew · houseplant

Drosera adelae, the lance-leaved sundew, is a beginner-friendly carnivorous houseplant from Queensland, Australia. Its sword-shaped leaves are covered in glistening, sticky tentacles that trap small insects. Grow it in wet sphagnum, bright light, and pure rain or distilled water, with no dormancy. Not ASPCA-listed; treat as mildly toxic and check with a vet.

Ideal humidity: Around 40-70%; tolerates 30% in cooler conditions

Watch for — No dew on the tentacles: The signature sticky droplets fail to form in low light, low humidity, or dry media. Move to brighter light, keep the sphagnum saturated, and raise humidity; new dewy leaves should follow within a couple of weeks.

The watering schedule, season by season

Lance-leaved 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 lance-leaved sundew is keep permanently wet via the tray method (1-2 inches of standing water); never let the media dry out, 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.

Use ONLY rainwater, distilled, or reverse-osmosis water. Tap and mineral water build up salts that kill sundews. D. adelae is forgiving of water level as long as the sphagnum stays saturated, so a humidity tray that you keep topped up works well year-round.

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 lance-leaved sundew in seconds.

How to tell lance-leaved sundew needs water

A calendar is the worst way to water lance-leaved 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 lance-leaved sundew for a day is almost always safer than over-watering it.

Overwatering vs underwatering lance-leaved sundew

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

Signs you are overwatering

Signs you are underwatering

Tap or bottled mineral water kills lance-leaved 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 lance-leaved sundew.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For lance-leaved 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 lance-leaved sundew.

Lance-leaved Sundew watering — frequently asked questions

How often should I water lance-leaved sundew?

Water lance-leaved sundew keep permanently wet via the tray method (1-2 inches of standing water); never let the media dry out. 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 lance-leaved 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 lance-leaved 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 lance-leaved 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 lance-leaved sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

What are the signs of an underwatered lance-leaved sundew?

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

Can I use tap water on lance-leaved sundew?

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

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