Fehmel-Steig, Karmen, Gold Prince
Amaryllidaceae

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All three are long-day varieties correct for latitude 47 degrees N, bulbing when daylight exceeds ~14 hours in June. Fehmel-Steig is a Swiss storage onion; Karmen and Gold Prince are sweet red and yellow types.
Mid-April is late for bulb onions from seed in the PNW -- normal start is indoors in February. Expect small-to-medium bulbs. Save remaining seed for an indoor start next February for proper-sized bulbs.
Direct sow 1/2 inch deep, 9 per sq ft. Keep consistently moist until bulbs start sizing, then reduce water as tops fall over. Shallow-rooted. When tops flop over naturally (August), harvest and cure in a shaded airy spot for 2-3 weeks before storing.