At the beginning of JuneI bought a pot of Zinnia “Swizzle Scarlet & Yellow”. Only one flower head was open at the time,. That flower was beautiful – the ray flowers were fuchsia in the center, then red and finally yellow at the tips. What I thought were disc flowers were not yet open, and red in bud. That flower-head is still in glorious bloom, over 1 month later! The “disc” turned out to be more ray flowers; the head just keeps growing larger as the central flowers push out. The head is now over 4” in diameter. In the meantime, five more flower heads have opened with the same splendid colors, although the latest three have genuine disc flowers. This is my first Zinnia, so my question is: is it typical for the flower heads to last this long? David Ehrlich