Anyone have any tips on getting Pothos to actually vine? I've had three different types (marble queen, neon and golden) for about a year and a half now and they've all been seemingly healthy, but don't really ever have any new growth. Each stem only has one or two leaves, so they're all fairly short plants despite being healthy. Since several of them have been like that for so long, I'm assuming it's a me problem, but wasn't sure what to watch out for; I've tried adjusting watering frequency and lighting levels (proximity to grow lights) over long periods of time but none of those changes seem to have had any effect, which makes me think it's something else.