Gardenscapes-Level 118 is quite difficult. Keep in mind that clearing both paths to the flowerbed is not a prerequisite of winning – clearing the path on one side will be enough.
Don’t rush into matching the flowers at the beginning of the level, wait for a much larger amount of them to gather on the field first. At the start of the level you should focus on revealing the bombs. Try to get the best combinations of explosions here, as the Rainbow blast can make a difference in the end of the level.
One more tip: try to detonate the bombs as high on the field as possible. The top stones are the hardest to eliminate and they can interfere with your progress even if you have already made your way to the flowerbeds.