Summarize the following:
Depending on your preference for the texture and taste of cilantro stems, you may want to remove some of the long stems of the cilantro. For salsas and curries, many find the cilantro stems add a pleasant amount of concentrated cilantro flavor. If your recipe doesn't specify on the inclusion of stems, use your best judgement.

Summary:
Decide how much of the stems you want to keep.