Unlike live plants you won't have to worry about artificial plants dying, becoming too large for your tank or even being eaten by your fish and looking tattered and unattractive. Maintaining plastic plants is very easy if they become dirty or covered with algae you can simply remove them from your tank and clean them without worrying about damaging roots, and because they are never in an aquarium before your own, they will not bring in pests or parasites from other places. Plastic plants have no light requirements, as opposed to living plants which often require lighting beyond what the average fish keeper has for their aquarium.