On a huge map, yes.
With this pattern, you already have 9:
cxcxc
xxxxx
cxCxc
xxxxx
cxcxc
Add some bonus grass, and the 10th should be possible as well.
Each city gets 4 tiles in ICS, 4 mined grass or irrigated plains should do the trick, the bonus grass can offset the 1 shield lost to corruption, in some cities.
I'm assuming this is meant for AA though, by te time you get to the IA, I don't see how this is going to of much use.
On smaller maps, especially tiny, your second city will already have so much corruption you need it to grow larger and have multiple bonus grass to get to 5spt.