A big sticking point was that the fatty lining around the embryo did not close properly after fertilization, and consequently it would dry out from the sun (native Pacific Rim species don't dry out because of afternoon thunder showers, temperatures that rarely surpass 30 ° C, and their own ability to store water). Only after sealing the embryos with lanolin or petroleum jelly was Chu able to produce large quantities of seeds.
沒想到朱建鏞種了 3 年都沒能結種，直到他破解一直結不了種的原因──受精後脂肪壁沒有閉合，胚胎被太陽曬乾（在原產地環太平洋地區，因午後會下對流雨，溫度不超過 30 度，加上朱槿花萼會儲水，胚胎沒有曝曬在太陽下乾枯的危機）。