Belgian Mums are a relatively new, trademarked breed of garden Chrysanthemums featuring profuse, densely-packed blooms and a pleasing mounded growth habit. Indeed, individual Belgian Mum plants can have well in excess of 600 buds and perhaps as many as 1,000. When in full bloom, the Belgian Mum forms a tight sphere of bright color.
Belgian Mums are increasingly available for purchase from garden centers and commercial greenhouses throughout their natural growing range, which includes USDA Hardiness Zones 4 through 9. Most commercial growers like the Belgian Mum as much as home gardeners do because Belgian Mums are exceptionally durable and do not damage easily during production, packaging, or shipping. This is also a blessing for home gardeners, who don’t have to worry so much about plant damage during the drive home or during the planting process.
Chrysanthemums are known for their wonderful autumn blooms, and Belgian Mums don’t disappoint on that count. In fact, varieties are available specifically bred for very precise blooming times. The Very Early Belgian Mums typically flower in the last week of August and the first week of September. Early Belgian Mums flower for two weeks in the middle of September. Mid-Season Belgian Mums bloom in the latter third of September. And the Late Belgian Mums flower through the month of October.
Belgian Mums are perennial plants. However, when late season varieties are put in the ground just before they bloom, there is little time to establish the strong root system required to endure through the winter months. Thus, many people grow mums as annual plants. If you want to maintain your Belgian Mum as a garden perennial, it's best to plant it early, water and fertilize it regularly up until flowering begins, and finally lay several inches of mulch after the flowering is complete and the winter months are nearing.