Lin Chun-liang points up several possible reasons why there have been no applications for these species. Perhaps no new varieties have been bred, or breeders think the potential market is too small to be worth the time and money required to apply for exclusive rights, or the breeders are able to ensure that the stock (parent) plants are not accessible to outsiders so there is no danger of piracy.
林春良指出，之所以沒人申請，可能是沒有新品種被育出，或是育種者評估市場規模太小，專利申請又耗時費力，不符合經濟利益，或者是屬「雜交優勢控制」品種，育種者只要控制好父母本不外流，就沒有被大量複製的疑慮，也就無須申請。