and Egyptian. Guess what? They all grew up side by side, and look just alike. The Slow-Bolt is the same size as the common dill. The taste is the same, too. They're all in flower now. I harvested enough leaves to fill the food dehydrator and after drying, have a big baggie full, probably 6 ounces or so. That's enough dried dill to last for years (of course the flavor won't last that long). I've been making crab salad for summer evening suppers, and that requires plenty of dill.
My opinion, after trialing several varieties of dill, from several seed sources, is, there is very little difference! All planted at the same time, they all went into flowering at the same time.