As if it's not bad enough that I get only very rare male blossoms on my zukes and patty pans, both of my Sunburst patty-pans' male flowers are pollenless. The stigma looks small and stunted and not a grain of pollen to be seen. The zuke nearby has plenty of pollen on his large, dusty stigma. Is this a phase they go thru? Weather induced? Bad seed? What's the deal?