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Watering schedule

How often to water Hamilton's Sundew (Drosera hamiltonii) — the schedule

Also called Hamilton's sundew.

More about hamilton's sundew

About Hamilton's Sundew

Drosera hamiltonii · also called Hamilton's sundew · houseplant

Hamilton's sundew is a Western Australian carnivorous plant producing large, paddle-shaped leaves densely fringed with sticky red glands that trap insects. It thrives in nutrient-poor, acidic, constantly moist media under bright light. Keep it in pure water — never tap — and avoid fertiliser. A rewarding windowsill or terrarium specimen.

Ideal humidity: 50–80%

Watch for — Blackening and dying leaves: Almost always caused by tap water minerals or fertiliser residue. Switch immediately to distilled or rainwater and flush the pot thoroughly. Affected leaves will die back but healthy new growth should emerge.

The watering schedule, season by season

Hamilton's 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 hamilton's sundew is keep tray with 1–2 cm of water at all times, 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 distilled, reverse-osmosis, or collected rainwater — never tap water. Stand the pot in a tray and keep it consistently wet year-round. The tray method mimics the boggy, seasonally wet habitats of southwest Western Australia.

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 hamilton's sundew in seconds.

How to tell hamilton's sundew needs water

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

Overwatering vs underwatering hamilton's sundew

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

Signs you are overwatering

Signs you are underwatering

Tap or bottled mineral water kills hamilton's 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 hamilton's sundew.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For hamilton's 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 hamilton's sundew.

Hamilton's Sundew watering — frequently asked questions

How often should I water hamilton's sundew?

Water hamilton's sundew keep tray with 1–2 cm of water at all times. 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 hamilton's 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 hamilton's 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 hamilton's 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 hamilton's sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.

What are the signs of an underwatered hamilton's sundew?

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

Can I use tap water on hamilton's sundew?

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

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