| As is the case with Japanese cedar trees, Japanese cypress trees which were widely planted around 10 years later than Japanese cedar trees are also gradually reaching an age at which they have a high pollen producing capacity. |
スギに10年ほど遅れて植林が広まったヒノキも、スギ同様に花粉生産力が強まった樹齢に次々と達している。 |