I have two pots of D. spatulatas (Frasier Island & "normal") that have been sending up multitudes of flower stalks, but none of the flowers seem to be making seeds as they close up. All I get are shriveled flowers and dried up stalks, which forces me to cut them off. I've read they're self-fertile but what can I do to help the process along? I never seem to catch them opening. Thanks very much.