Trifolium Ripens ?helpmeouthere?
I tried to get a plant once when I got lazy looking for 4 leaf clovers
You guessed it - no luck!
However as it happens I know of several patches of 4 leaf clovers - they are never exclusive and quite elusive. But once you find a cluster you can return year after year and they will be there, though this is not the best time of year. May/June and after a long dry spell followed by a few days rain and a day or two for growth - is the formula.
The sods at Railtrack here in the UK had a fright with subsidence locally and dumped ballast right on the nearest target area but they can't keep 4 leaf clovers down - by their nature they are the hardiest mutants - I found 4 in a miniscule patch at a hit rate of maybe 5% which is very high for 4 leaf clover hunting

I know, I know - call me sad - but potentially a lucky sad individual. Unemployed - but those 4 leaf clovers are gonna work someday!