PORTLAND, Ore. (AP) — Hemp growers and entrepreneurs who were joyous a year ago after U.S. lawmakers reclassified the plant as a legal agricultural crop now are worried their businesses could be crippled if federal policymakers move ahead with draft regulations.

Licenses for hemp cultivation topped a half-million acres (200,000 hectares) last year, more than 450% above 2018 levels, so there’s intense interest in the rules the U.S. government is creating. Critical comments on the draft have poured in from hemp farmers, processors, retailers and state governments.

Growers are concerned the government wants to use a heavy hand that could result in many crops failing required tests and being destroyed. The U.S. Department of Agriculture, the agency writing the rules, estimates 20% of hemp lots would fail under the proposed regulations. “Their business is to support farmers — and not punish farmers — and the rules as they’re written right now punish farmers,” said Dove Oldham, who last year grew an acre (0.40 hectares) of hemp on her family farm in Grants Pass. “There’s just a lot of confusion, and people are just looking for leadership.”

The USDA did not respond to the criticism but has taken the unusual step of extending the public comment period by a month, until Jan. 29. The agency told The Associated Press it will analyze information from this year’s growing season before releasing its final rules, which would take effect in 2021.

Agricultural officials in states that run pilot hemp cultivation programs under an earlier federal provision are weighing in with formal letters to the USDA.

“There are 46 states where hemp is legal, and I’m going to say that every single state has raised concerns to us about something within

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