A month ago a large portion of our lawn was a carpet of blue scilla. It took decades for the scilla to multiply so prolifically, and it's a wonderful and lovely harbinger of spring. What could be the problem? A month has passed and lawns need mowing. The blue lawn is now a verdant thicket of green scilla leaves, but they mow right? Sort of. The leaves of scilla contain a considerable amount of mucilage and moisture. The discharge from you mower is basically green slime. Generally the best strategy is to simply wait until the scilla leaves begin to yellow and fade before mowing the densest parts. Even where the scilla isn't solid, it can get so slippery, you can barely get enough purchase to push the mower! Ah, well, nothing's perfect.