For that reason you need to put your National Drug Code (NDC) into a Universal Product Code (UPC) barcode in the United States. A UPC-A barcode symbol contains a GS1 GTIN-12 data structure. Here is what you need to do to convert your NDC into a GS1 GTIN-12:
How to Harvest Cilantro. 1  Cilantro leaves can be cut at any time during their growth period, but waiting until the plant is about 6 inches tall will give you optimum leaves.  Cut the outer leaves first, allowing the smaller leaves that are closer to the stalk to continue to grow and mature.
Now that you know how to harvest cilantro, you know that cilantro harvesting is easy and painless. Harvesting cilantro is an excellent way to have fresh herbs for your Mexican and Asian dishes as well as keeping your cilantro plants usable a little longer.Print This Article. Print This Article.ou should be harvesting cilantro about once a week. If the plant is growing well, you can harvest more often than this. Either way, you will need to harvest the cilantro at least once a week to help stave off bolting.