When it comes to ornamental onion plants, fertilizing is key to their growth and flowering. It is recommended to use horn shavings, horn meal, or brown grain until the plant begins to bloom. Once the flowers appear, the bulb will ripen, and fertilizer will no longer be absorbed. This can be indicated by yellowing and wilting leaves. It’s important to wait until the foliage has completely wilted before cutting it off, as this allows the plant to store nutrients in the bulb for future use.
When planting ornamental onions, it’s a good idea to do so in a background or alongside perennials such as lady’s mantle, geraniums, peonies, and catnip. This not only helps conceal any yellowing leaves but also allows other plants to fill in the space as the ornamental onions wilt. The best time to plant these bulbs is during autumn in a sunny or partially shaded location. When preparing the planting hole, make sure to add sand or gravel at the bottom as a drainage layer before placing the bulb. These plants are hardy and can remain in the ground even after they have bloomed for future seasons.
By using proper fertilization techniques and planting methods, you can ensure that your ornamental onion plants thrive and continue to bloom year after year in your garden.