There are only about 3 allium plants left from the 10 pots of sprouting bulbs I planted 3 years ago, which did really well in the first year. This is partly due to other plants overwhelming them – fair enough. Also, I let the plants go to seed, because the seed heads look very attractive. A gardener at the National Botanic Garden said they will become weaker if you don’t dead head. The solution is to plant fresh each year. I’ll try planting some bulbs myself in pots or troughs this summer, and plant them out next spring.