Staff said later the man was in such pain he couldnt talk.
The Featherston Volunteer Fire Brigade, who were first to attend, praised the staff for their quick thinking and action in cooling the man down.
He was taken by helicopter to Hutt Hospital.
Police were notified and found 10 cannabis seeds when they went to the property.
Meyers lawyer Richard Leith said his client had lost his job because of his injuries and was on ACC.
Judge David Cameron convicted and sentenced Meyer to 75 hours community work and ordered the destruction of any drug-related paraphernalia.
Additional reporting, Wanganui Chronicle.