《天工开物·上篇·彰施》
其余的几种蓝都是把种子撒在园圃中，春末就会出苗，到六月采收种子，七月就可以将蓝茎割回来用于造淀了。
其余蓝皆收子撒种畦圃中。暮春生苗，六月采实，七月刈身造淀。
The other blues are sown in the garden, and the seedlings will emerge in late spring. In June, the seeds are harvested, and in July, the blue stems can be cut back for starching.