This level relies heavily on firecrackers falling on flowers.
Set off as many as you can while making rows against the oysters. If you move them quickly by making rows that touch as many oysters as you can, it saves moves later.
Use combinations in between oysters and firecrackers.
Keep matching the crops with the most value first.
This level can be done without using companions, but the grower ones does help, as it means you don't need to rely on just the firecrackers hitting them.
Its very hard to make rows against the flowers but not impossible, so plan moves carefully.