At level 6 you unlock some new items with some major perks. The game is picking up as you have more crop options with different growing

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times to fit your lifestyle- you can choose crops that grow in a few hours if you like coming back to
FarmVille several times throughout the day, or pick ones that take a few days, if you prefer.
The longer a crop takes to grow, the more experience you earn for planting it (and in general, slow-growing crops bring in a nice return on coins). However, if you do like to tend to your farm many times during your day, you can earn even more experience (and coins) then you would if you choose to wait several days before revisiting your farm.
A tip for players who do like to play throughout the day: Plant about half of your farm with crops that grow quickly and the other half with crops that grow over time. The cash-crops (slow-growing) will help you save coins for big items you will want, like a barn or a dairy farm, and the quick-growing ones can earn you fast money and experience.