That's the first thing I thought of. I can't say I recall seeing this with a shimpaku, but I have two male Rocky Mountain Junipers that flower sort of like that. The tips of the foliage turns a light brown, then swell and turn a more yellowish color as they start to release pollen, then fall away and start growing normally.I wonder if it isn't the "male" or "female" version that makes pollen instead of little white flower. Some of my shimpaku make tiny white buds that eventually turn into berries. I also have other shimpakus that make brown tips that eventually release pollen.
anybody else has experienced this?