Because seeds take longer to produce edible bulbs or flowers than do seedlings, starting the seeds indoors before planting outdoors makes sense. In fact for some flowering alliums (A. Or, in areas with more mild winters, sow the seeds in late summer, fall or mid winter.Click to see full answer. Subsequently, one may also ask, how long do allium seeds take to germinate? 12 weeks Also, do alliums multiply? Alliums adore sunlight and will perform best when they can bask in it all day long. Since most of them multiply naturally, they can be left untouched in the same area for years. Some ornamental alliums grow more like chives and what you plant is a clump of roots rather than bulbs. Besides, can you grow Allium from seed? Alliums are spectacular plants, so it’s worth saving a few seeds to sow in spring to grow more for the garden. Seeds from cultivars won’t be true to type, but it’s fun to grow them anyway and see what you get. The seeds will germinate quickly and reach flowering size in a couple of years.Do allium bulbs spread?For accents with larger varieties, space up to 2′ apart. While some species spread vigorously through seeds or bulbils, many varieties do not spread at all. Planting: Plant bulbs in fall for a spring bloom. Plant dormant allium bulbs in the fall according to your growing zone.