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Watering schedule

How often to water Derby Sundew (Drosera derbyensis) — the schedule

Also called Derby sundew.

More about derby sundew

About Derby Sundew

Drosera derbyensis · also called Derby sundew · tropical

Drosera derbyensis is a petiolaris complex sundew named after Derby in the West Kimberley region of Western Australia, where it inhabits seasonally flooded sandy flats and grasslands subject to the intense monsoon climate. It is closely related to Drosera ordensis and Drosera kenneallyi, sharing their requirement for a pronounced hot wet growing season and a warm, distinctly drier rest period. The most critical care point is that this species must be kept warm throughout the year — minimum 18 °C even in the dry rest — as cold and wet in combination is rapidly lethal to the rhizome. Drosera is not listed as toxic to cats or dogs by the ASPCA and is considered non-toxic to pets.

Ideal humidity: 55–85% (growing); 35–55% (rest)

Watch for — Crown and rhizome rot: The most common cause of plant death in cultivation. Cool temperatures combined with wet soil destroy the rhizome within weeks. Ensure the minimum temperature stays above 18 °C and drastically reduce watering as soon as the plant begins its rest phase.

The watering schedule, season by season

Derby 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 derby sundew is standing tray method (growing season); reduced to near-dry (rest), 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 2–3 cm of pure water (rain, distilled, or RO) in the tray continuously during the growing season. As the plant approaches its dry rest, gradually reduce water over 3–4 weeks until the soil is only barely moist; never waterlog in cool conditions.

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 derby sundew in seconds.

How to tell derby sundew needs water

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

Overwatering vs underwatering derby sundew

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

Signs you are overwatering

Signs you are underwatering

Tap or bottled mineral water kills derby 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 derby sundew.

Seasonal and environmental adjusters

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

Derby Sundew watering — frequently asked questions

How often should I water derby sundew?

Water derby sundew standing tray method (growing season); reduced to near-dry (rest). 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 derby 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 derby 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 derby 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 derby sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

What are the signs of an underwatered derby sundew?

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

Can I use tap water on derby sundew?

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

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