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Watering schedule

How often to water Climbing Sundew (Drosera macrantha) — the schedule

Also called Climbing sundew, Bridal rainbow sundew, Large-flowered sundew.

More about climbing sundew

About Climbing Sundew

Drosera macrantha · also called Climbing sundew, Bridal rainbow sundew · flowering

Drosera macrantha is a scrambling to climbing tuberous perennial carnivorous plant endemic to south-western Western Australia, where it grows in winter-wet depressions in sandy, loamy, laterite, or quartzite soils. Its long stems — reaching up to 1.5 m — twine through surrounding vegetation using sticky glandular leaves as makeshift hooks. Like all tuberous sundews it follows a winter-active, summer-dormant lifecycle, and the single most important care rule is completely ceasing irrigation once dormancy begins in late spring. Drosera is not definitively listed by the ASPCA; treat as mildly-toxic for pets.

Ideal humidity: 40–60%

Watch for — Stem collapse during dormancy transition: Stems become limp and mushy as the plant senesces — this is normal die-back, not disease; remove dead top growth and allow the pot to dry down gradually rather than cutting off water abruptly.

The watering schedule, season by season

Climbing 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 climbing sundew is tray method autumn–spring; bone dry summer dormancy, 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.

Keep soil continuously moist during the growing season using only distilled or rainwater; once leaves yellow and die back in late spring remove the pot from the tray and allow the substrate to dry completely for 3–4 months.

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 climbing sundew in seconds.

How to tell climbing sundew needs water

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

Overwatering vs underwatering climbing sundew

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

Signs you are overwatering

Signs you are underwatering

Tap or bottled mineral water kills climbing 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 climbing sundew.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For climbing 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 climbing sundew.

Climbing Sundew watering — frequently asked questions

How often should I water climbing sundew?

Water climbing sundew tray method autumn–spring; bone dry summer dormancy. 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 climbing 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 climbing 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 climbing 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 climbing sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

What are the signs of an underwatered climbing sundew?

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

Can I use tap water on climbing sundew?

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

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