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Is Hottonia palustris a tropical or coldwater plant?
It is a temperate species that prefers cooler water. It is best kept in unheated or cool-water aquariums below 22°C and is also suitable for outdoor ponds.
Does it need CO2?
CO2 supplementation is beneficial and helps produce the most compact, healthy growth. It can be kept without it but may grow more slowly.
Can it be floated or does it need to be planted?
It can be floated or gently anchored in a sandy or fine substrate. Floating it is effective for providing surface cover in cooler water set-ups.
Will it grow in a tropical aquarium?
It is not ideally suited to consistently warm tropical temperatures above 22–24°C and tends to decline over time in heated tanks.
Is it native to the UK?
Yes. Hottonia palustris is native to Europe including the UK, where it grows in clean ponds, ditches, and slow-moving waterways.

