Article in English: Depending on the amount of sun your plants receive, you may have to water them as often as every day. Fertilizer helps the kale grow strong and robust and keeps it producing healthy, sweet leaves. Make sure that the kale is at least six inches tall before you mulch your plants. Mulching helps prevent wet soil from sticking to leaves and molding them. Doing so helps to reduce the chance of harmful pests. The plant should be at least eight inches tall before you harvest the leaves. Be aware that growing time varies according to each variety, so be sure to look up the appropriate time before harvesting.  Pick off the outside leaves first if just harvesting individual leaves. If harvesting the entire plant, cut the stem down to about two inches above the soil with one clean cut. This will allow the plant to continue to produce leaves. Don't leave the leaves on the plant for too long after they are ready for harvest. Doing so will produce bitter, tough leaves.

Summary in Chinese:
土壤要保持湿润。 甘蓝生长期时，每6-8周就要施一次肥。 如果发现叶子开始腐烂或褪色，一定要施一点护根肥。 褪色、枯萎的叶子一出现就要及时修剪。 播种70-95天或移栽55-75天后就可以收获了。 开始享用吧！