I haven't been able to find much information on this. Only one source, to be precise, which said that giganthemums are weaker than ordinary somniferum and that one would have to use the same amount of the much larger pods to get the same effect. With ordinary P. Somniferum growing in my garden alongside the giganthemums, I found 10-12 pods to be a good amount. My giganthemums are oblong, ~4"x2" pods. A ballpark figure for number of pods or dry weight of straw would be much appreciated (I may not have enough of this material to determine potency experimentally). I assume that asking for an estimate of potency for stem material with these would really be a stretch (I use 6" or so of stem with the ordinary somniferums).