Hey, that’s awesome you’re diving into lupines-they’re such stunners with those vibrant spikes! I’ve tinkered with Lupinus polyphyllus indoors in a south-facing window, and it can work if you go big on light, but yeah, it’s more of an outdoor champ. For beginners, start with a deep pot (at least 12 inches) using well-draining, slightly acidic soil mix-like a blend of potting soil, perlite, and a bit of peat. Water sparingly to keep it moist but not soggy; overwatering leads to root rot quick. To fight legginess, supplement with full-spectrum grow lights for 14+ hours a day if your window isn’t blasting sun. Mine flowered after a couple months, but it got tall and floppy-stake it early! Totally doable with patience, though. Anyone else had luck taming these indoors?