Crassula helmsii
Crassula helmsii
(swamp stonecrop)
Plants
Exotic
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Impacts

12 results for Crassula helmsii (swamp stonecrop)

Impact ID Scientific Name Impact Type Study Type Study Location Impact Description Reference
5601 Crassula helmsii Competition Anecdotal N/A Crassula helmsii can limit water circulation and change oxygen regimes outcompeting native... 29344
5640 Crassula helmsii Competition Observational Field Crassula helmsii suppresses surrounding epiphytic and planktonic algae more than the... 29479
5641 Crassula helmsii Competition Anecdotal N/A In some areas of the United Kingdom this Crassula helmsii is highly invasive and it... 29339
5642 Crassula helmsii Competition Observational Field Crassula helmsii shows extreme competitiveness, dominates many sites, and can cover the... 29479
5643 Crassula helmsii Competition Anecdotal N/A In neglected nursery tanks it was observed that Crassula helmsii took over and chocked out... 29473
5644 Crassula helmsii Competition Observational Field Crassula helmsii was observed to outcompete Potomogeton spp. in England. 29340
5645 Crassula helmsii Competition Experimental Laboratory Crassulacean acid metabolism confers a competitive advantage for Crassula helmsii in... 29481
5646 Crassula helmsii Competition Observational Field Crassula helmsii suppresses germination of other species up to 83%, yet there was no... 29482
5650 Crassula helmsii Competition Anecdotal N/A Crassula helmsii reduced the abundance of Elodea spp. after the introduction into... 39685
5651 Crassula helmsii Competition Observational Field It was observed that for every 10% increase in Crassula helmsii there was a 6% decrease in... 39943
5653 Crassula helmsii Competition Experimental Laboratory Crassula helmsii is able to remain green in the winter and able to continue photosynthetic... 39643
10010 Crassula helmsii Competition Observational Laboratory In a laboratory experiment, Crassula helmsii became dominant over Littorella... 45518

View all impact types for Crassula helmsii
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Citation information: U.S. Geological Survey. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/13/2026].

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