The readings for this word are both kun'yomi, but you haven't learned this kun'yomi for 雌 yet, so here's a mnemonic to help you:
Just think of someone asking you to differentiate female flowers from male flowers. Can you? "Meh (め), probably not."
The reading of 花 is the rendaku version, so watch out for that too.
You can’t cross a 30 year old Himalayan Cedar with a female flower.