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Jam Chan, marketing general manager at Osmunda, a service firm that advises Chinese medical product firms on getting overseas approvals, said many recently developed tests in China haven’t gone through strict clinical trials, which means the self-declared accuracy rate printed on the products is not properly validated.

Peat moss or one of the coarse fibers, such as osmunda or coir used for epiphytic orchids, are good choices of organic materials that aerate a potting mixture while at the same time retaining water.

Although it was against the rules, they often stuffed bracken, osmunda, and other ferns inside their uniforms and brought them home to their mothers to make side dishes.

Beyond the ridge there was a clear pool, whose amber-colored water rested on a bed of silver sand; along one side rose the tall, delicate plumes of the Osmunda regalis.

These conditions of orchid-growing have undergone great changes of late years, and the plants are grown much as other stove and greenhouse plants in ordinary pots with composts not only of peat but of leaf-mould, and fibres from osmunda and polypodium ferns.