By Tom Glasgow
Marijuana is legal in some states but not others, and that’s just the way it is. You have to be familiar with varying state laws, and not assume that just because an activity is allowed in one state, it will also be tolerated everywhere else.
That’s a bit obvious, perhaps, but the same idea applies to certain other members of the plant kingdom, in particular plants that are designated as aquatic weeds.
Water lettuce (Pistia stratiotes), as one example, is an attractive aquatic plant that occasionally shows up in water gardens in North Carolina. It’s common in the aquarium trade, and often finds its way into ponds or streams when aquariums are cleaned out.
Water lettuce isn’t currently illegal in North Carolina, but there is great concern in many other regions and states about the aggressiveness and spread of this plant. For example, possession or transportation of water lettuce is prohibited in Texas, South Carolina and Wisconsin.
While water lettuce is described as a tropical or sub-tropical plant with distribution limited by sensitivity to cold temperatures, it