Lablab beans not flowering

Hi,

I have one lot of lablab beans growing quite well on the side of my garden shed. There are no flowers, however, and some of the leaves are a bit yellow with green veins. Another lot don't have the yellow/green-veined leaves but neither do they have flowers. What are they missing?

I'm NOR in Perth, Western Australia (temperate climate).

Thank you in advance for any advice!

Hm. This year I planted purple lablabs, my first time for them, and it took FOREVER for them to flower. I only finally got enough pods to harvest and eat this weekend, and the vine has been there for a few months at the least. We have cycled through heat and cool and wet and dry and are now just heading into fall.

I did some searching online and it sounds like they don't really put out the flowers until the days start getting shorter. My family in a much hotter area of Brazil grows them and I assumed the lablabs would love the heat but that hasn't been the case for me (also, these seeds I got from abroad, so who knows). So maybe just hang on and watch them. If I understand right you've had a heck of a hot summer there, maybe they just need cooler weather.
And a pic of my huge harvest--- it fed two of us!

Many thanks, Tereza! Our summer has been up and down in terms of heat - nowhere near the constant heat that we used to have. It makes sense that the beans are reacting to that - it hadn't occurred to me at all.
I'll hold out for a harvest then, even if it's modest - even just a few beans from my own garden will taste sweeter than all the bought ones!