I live in Central Coastal Florida (Space Coast). This dainty little fern-type weed showed up last year. I let it grow in a bed on the side of the house because once established, it seemed to block out other weeds. Now, however, it has found its way to other parts of my yard and is growing in potted plants as well as cracks on my patio. What is it? And how can I keep it off the patio? While I'm asking, what's the best way to get moss to stop growing on the bricks? It's slippery when it's wet.