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Can I say,

(a) Before planting the potatoes, he clears the land and weeds all the wild plants. The next thing he does is to prepare the beds.
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clears the land and weeds mean the same thing really, so you are repeating yourself. Otherwise ok.
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(a) Before planting the potatoes, he clears the land and weeds all the wild plants. The next thing he does is to prepare the beds.

"Clears the land" sounds like the American pioneers, chopping down trees to plant fields of corn.

(a) Before planting the potatoes, he weeds out all the wild plants and then prepares the beds.

If you want to keep your original, drop the "to" in "to prepare."
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Comments  
So, the correct way to say is ...?
 BarbaraPA's reply was promoted to an answer.
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Can I say,

(a) He clears the weeds and wild plants and prepares a few beds for sweet potatoes.
Is that correct to say?