When growing ornamental onions, it is recommended to use horn shavings, horn meal, or brown grain as fertilizer until the plant begins to flower. At this point, the bulb will ripen and the fertilizer will no longer be absorbed. It is crucial not to cut off the foliage until it has completely wilted, as the plant stores nutrients in the bulb until then. Cutting off the foliage too early can steal energy needed for flowering the next year.
When planting ornamental onions, it is best to do so in a sunny or partially shaded location, and alongside perennials such as lady’s mantle, geraniums, peonies, or catnip. This can help hide any yellowing leaves and fill in the space once the onions have wilted. The ideal time to plant ornamental onions is in autumn. Proper drainage should also be ensured by filling the bottom of the planting hole with sand or gravel before planting the bulb. It is important to leave the bulbs in the ground even after they have flowered, as they are very hardy.
Following these planting and care tips can help ensure successful growth and continued beauty of ornamental onions in your garden.
