Mushrooms and flowers should NEVER be allowed on the same board together. Horrible!!
You need to clear the flowers at the bottom of the screen where the mushrooms are sat, but making new baby mushrooms isn't going to do you any good until you have moved the flowers as they are stopping them spreading.
Watch the crops on the logs as they can help you make a row, ideally in between the flowers to open more than one.
Crops should be not too hard to collect, its the flowers that are not playing nicely for me!