What we can learn about churches from yards

Last Saturday, I spent a lot of the day (along with my wife & kids) working on our yard. One of the big tasks we undertook contained some lessons.
We started with this:
In my wife’s words, we aren’t really huge yard people. Eventually this piece would get overgrown with weeds during the year. So, we decided it was time to take it out and return the land to grass. This was a huge task.
In particular, the big bushy plant had to be pulled out at the roots, which meant digging down deep with a shovel.
The plant was pretty resistant. We had to tear it out piece by piece. Anything comes out given enough time, work, tools, pressure and destructive force.
Finally, we had the plant out, ready to throw on the garbage heap:
Afterward, we spent several hours hoeing, tilling and digging up all the weeds in the dirt (and discovering about a dozen grass snakes). At length, after a day of backbreaking work, we had this to show for our efforts:
Throw some grass seed on it, and in a few months you won’t be able to tell a plant was ever there.
Now–think about this in terms of the Parable of the Sower, and consider the church as a rooted plant in one spot. Beautiful, when it’s there: but this particular little bush wasn’t multiplying at all, it wasn’t competing with the weeds, and it had no defenses against our shovel.
The weeds, on the other hand, sprout practically overnight, and no matter how many times we dig them up–more come. They rapidly multiply and resist all efforts to eliminate them.
Is there a parable in this?