Growing moss free grass is not that hard when you do it right. Where do you live? What is your watering schedule (how long and how often)? When were the last two times you fertilized and what did you use? Spectracide makes a lot of products. What did you buy?

In the reverse, growing grass-free moss is difficult and touchy. :-) It's rather specifically tuned stuff.

Irish moss (Sagina) might fit the bill here and it does grow a little more consistently. Like all moss, it's intolerant of dry conditions or excess direct sunlight, so it may not work in all areas of your yard, but will put up with a bit more than the random mosses.

Mosses dislike pH shifts, so never feed. They're utterly intolerant of most herbicides, and completely hate any iron in anything applied as it's toxic to them. Most other metals will also kill them, but are rare in most items.

In a moss field on soil, you're going to get weeds. Conditions that are good for moss are also good for weed sprout. Treating the weeds, however, will kill the moss. There's no way around that.

... which is why we have grass lawns and not soft moss lawns. Is there another forum for growing moss??? ;-)

Moss is, for the most part, an opportunistic bottom-dweller on the evolutionary scale. It will not compete or thrive where higher plants (like weeds and grasses) thrive. That would mean that grasses will be a weed forever in a "moss lawn". You'd have to make an environment where weeds and grasses can't survive to have an all-moss lawn. That would be pretty tough to maintain.

I remember a moss lawn/garden area when I was growing up in Pennsylvania. It was situated alongside a creek just like mine with dappled shade. Gorgeous. However my lawn does get sun between 11 AM and 3PM in the dead of summer or for about two months, then it goes back to dappled shade.

All I know is the moss has creeping aggressively the last two years, or after I started spending less time on the actual lawn itself. There are areas where the moss has completely covered areas that were once lush. It looks like it's winning, even spots were it's semi compacted and dryish, but I'm thinking it probably won't spread that far.

Thanks folks!

I wish you had gotten an answer that was on topic.

"I wish you had gotten an answer that was on topic."

Actually, there were several answers on topic.....just might take a small bit of digging through the BS to suss out :-)

Moss will grow well under conditions that lawns will not - shade (even heavy shade), compacted, low fertility soils, low pH and consistent moisture. Moss lawns will not react favorably to any lawn herbicide so any weeding must be manual. But if you prep thoroughly and properly clear the area first before attempting a moss lawn, your weeding will be minimal.

btw, for a bit of clarification, Scotch or Irish moss, Sagina subulata, is not a moss at all, despite the common name. It is a very low growing, creeping and flowering perennial in the carnation family. And will not grow under the same conditions that a true moss will. Mosses reproduce by spores, not flowers!

ETA: There is a Mosses, Ferns and Cryptogams forum here that may provide additional details on how to develop, establish and maintain a moss lawn.