My experience with this vine is limited, so far. But it seems better grown en masse rather than just 1 or 2 vines. Martin gave me my seeds & our climates are very similar, so it looks like this vine likes "warm" but not "hot"...maybe it's well suited to warm by day & cool by night - the typical Pacific Northwest summer season.
My volunteer seedlings came up pretty early, then just sat there...tiny plants with a few leaves and no "vine". Now that we've had a few warm days, they're starting to vine. I'm anxious to watch their performance, as these are the first plants to grow from a direct-seeded scenario (I started my previous vines indoors & transplanted them).
USDA Zone 8b
Heat Zone 3
Sunset Zone 5
SeaTac, WA...one cool place