Baby verde is actually the best money even in the field, If you have gnomes or boomboxes to max out your yield and flowers to make them 15 second harvests, you get $80 profit each one every 15 seconds. I can make like 5k a minute doing that easily. Then when I get bored I do 12 hour or 1 day ones and let them sit.

This is my field, maximum bonus to speed and maximum bonus to yield on all of them, once I get more money I can open 8 more slots and still have maximum using a higher level item to speed time. Right now it is growing some 1 day stuff that cost 1k each, but spamming baby verdes is the big bucks.