SubRosa
BS Bulldozer
What I was getting at was how far can you go in a cultivar description with regards to what is needed in order to express the claimed unique characteristic [emoji4]
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Personally I would draw the line at parameters not readily alterable under reasonable circumstances. Manipulation of light, moisture, and/or soil chemistry being required for a cultivar to express its uniqueness shouldn't disqualify it from holding cultivar status. Even a requirement of CO2 supplementation works for me, particularly in the case of aquatic plants.