Watering schedule
How often to water King Sundew (Drosera regia) — the schedule
Also called king sundew, regal sundew.
More about king sundew
About King Sundew
Drosera regia · also called king sundew, regal sundew · houseplant
King sundew is the largest sundew, native to a single South African valley, with strap-like leaves to 70 cm tipped in glistening, insect-trapping mucilage. It demands bright light, pure water, a peat-sand carnivorous mix, and a winter cool rest. Feed it gnats, not fertiliser. A temperamental but spectacular carnivore.
Ideal humidity: 50-70%
Watch for — Mineral burn from tap water: Using tap or filtered (not RO/distilled) water makes leaf tips brown and the plant decline. Switch to rainwater, distilled or reverse-osmosis water only.
The watering schedule, season by season
King 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 king sundew is keep the pot standing in 1-2 cm of water at all times; top up before the tray runs dry, 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.
- Spring & summer (active growth): 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.
- Autumn (slowing down): Autumn: lower the tray water level as growth slows and (for temperate species) dormancy approaches.
- Winter (rest / dormancy): Winter: keep just damp, not flooded — many temperate carnivores need a cool dormancy with far less water.
Use only rainwater, distilled or reverse-osmosis water (under ~50 ppm TDS). Tap-water minerals build up and kill the roots. Tray-water the pot from below; never let the medium fully dry.
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 king sundew in seconds.
How to tell king sundew needs water
A calendar is the worst way to water king sundew. Check the plant and the soil instead — for this species, look for these signals in order:
- 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 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 king sundew for a day is almost always safer than over-watering it.
Overwatering vs underwatering king sundew
The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For king sundew specifically:
Signs you are overwatering
- Blackening traps or pitchers from stagnant, warm, mineral-laden water.
- Rotting crown if kept warm and flooded through winter dormancy.
Signs you are underwatering
- Traps go limp and brown; pitchers dry up.
- The medium dries out and the plant collapses quickly.
Tap or bottled mineral water kills king 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 king sundew.
Seasonal and environmental adjusters
Every figure above shifts with the conditions in your home. For king sundew, the levers that matter most are:
- Bright light plus the water tray is the whole game — no fertiliser ever goes in the soil.
- In hot weather the tray empties fast; check it daily.
- Temperate species need a cooler, drier winter dormancy, not constant flooding.
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 king sundew.
King Sundew watering — frequently asked questions
How often should I water king sundew?
Water king sundew keep the pot standing in 1-2 cm of water at all times; top up before the tray runs dry. 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 king 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 king 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 king 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 king sundew. Its roots cannot handle dissolved minerals — only rain, distilled, or reverse-osmosis water will do.
What are the signs of an underwatered king sundew?
Traps go limp and brown; pitchers dry up. The medium dries out and the plant collapses quickly.
Can I use tap water on king sundew?
Only rainwater, distilled or reverse-osmosis water — never tap, mineral or softened water. This is the single most important rule for king sundew.
Keep reading
- Watering king sundew in the UK — hard vs soft tap water
- King Sundew care — the full brief (light, soil, humidity, problems, pet safety)
- Watering calculator — get a starting interval for your exact pot and light
- Pot size calculator — the right pot keeps watering forgiving
- Overwatered plant — signs and how to recover it
- Underwatered plant — signs and how to rehydrate it
- Why is my plant wilting? Wet vs dry diagnosis
- How often to water snake plant
- How often to water dracaena
- How often to water peperomia
- All 2464 watering schedules in the Growli library