Plant left-facing Repeaters on the right side of the lawn. Then, plant Snow Peas on the left side. Use Potato Mine to deal with the Buckethead Zombies. You should, however, be careful when you plant them. Additionally, Wall-nuts can be used to stall the Buckethead Zombies while the Potato Mine is arming itself. You can also use Snow Peas to slow down Buckethead Zombies.
To the Left is possibly a reference to the dance and song Cha Cha Slide, although one can consider the word "to" to reference it being the second Vasebreaker level ("to" as in "two"). Also, the word "two" can refer to the fact that Repeater shoots two peas, as left-facing Repeaters are introduced here.