OK, I was sketpical of a slow bolting cilantro, but it really did the trick. I found it slow to start, but—when started in early spring—it is JUST NOW starting to bolt in July. I did successions of it every 4 weeks, which was excessive given how slow it bolts. I will only be purchasing this cilantro next year.
Cilantro/coriander - an annual or biennial herb (coriandrun sativum), of the Parsley family, usually grown for it's aromatic seeds which are used for flavoring liquors and confections. The plants, which grow about 2 feet high, are cultivated in rows about 18 inches apart, generally from seed sown in early spring. The seed heads which ripen about midsummer are gathered and dried, then beaten with light rods or flails to spearate the seeds.
The leaves are most commonly referred to as cilantro and have a much different taste from the seeds, one that is similar to parsley with a dash of citrus flavor.