Likely it's little more than a big holder panicking before the numbers come out in a few days. As there's little recent verifiable data available on GRO, the market has priced it "for disaster" causing some to panic as the report approach. Selling often causes others to sell in fear.
As with many Chinese companies, the numbers are often viewed as suspect... Assuming this report confirms they still have loads of cash and liquid investment assets with minimal debt, and are generating reasonably significant revenue (which there's no reason to assume they're not), this upcoming report could be the confirmation needed to move this stock back to significantly higher levels.