Viburnum is not a viburnum fast growing plant in the strict sense. NC State Extension rates arrowwood viburnum as a medium growth rate shrub. It won't shoot up overnight, but it won't crawl along either. You can expect steady gains each year that add up over time.
The viburnum growth rate depends on which species you pick. Arrowwood viburnum puts on about 12 to 24 inches (30 to 60 cm) of new growth per year in good conditions. Some species like doublefile viburnum grow faster than that. Blackhaw viburnum grows slower. I tracked my own arrowwood shoots with a tape measure over three seasons to see what medium growth looks like.
In year one, my new arrowwood viburnum added about 14 inches of fresh growth on its longest branches. Year two jumped to 20 inches after the root system got established. By year three, the plant was pushing out 18 to 22 inches of new wood each season and the canopy filled in fast. That's what a medium viburnum growth rate looks like in real time.
Medium growth rate means you won't have a full-size hedge from small plants in one season. A 3-gallon nursery plant takes about 4 to 6 years to reach its mature height of 6 to 10 feet. That timeline tests your patience, but the payoff is a dense, strong shrub. Fast-growing plants often have weak wood that breaks in storms. Arrowwood builds tough branches that hold up well.
You can push the growth rate higher with the right care. Full sun is the biggest factor. Plants in 6 or more hours of direct light grow faster than shaded ones by a wide margin. Consistent water during the first two years helps roots spread fast. A 2 to 3 inch layer of wood chip mulch keeps soil moist and cool while feeding the root zone as it breaks down over time.
Maximize Sun Exposure
- Light needs: Give your arrowwood at least 6 hours of direct sun for the fastest growth each season.
- Shade effect: Plants in heavy shade grow about half as fast and produce thinner, weaker branches overall.
- Best placement: South or west-facing beds give the most light in northern zones for strong annual gains.
Water and Mulch Right
- Watering schedule: Give 1 inch of water per week during the first two growing seasons for fast root spread.
- Mulch depth: Spread 2-3 inches of wood chips around the base but keep them away from the trunk to prevent rot.
- Long-term care: After year two, the roots handle most dry spells on their own without extra watering.
Avoid Root Wars
- Tree competition: Don't plant within the drip line of large trees because they steal water and nutrients from your shrub.
- Spacing: Give your viburnum 6 to 10 feet of open ground away from other big plants for the best growth.
- Soil prep: Loosen the soil in a wide area before planting so roots can spread out fast in the first year.
So how fast does arrowwood viburnum grow in the end? Plan on 3 to 5 years from a nursery plant to a solid, eye-catching shrub. Give it 5 to 8 years to hit full mature size. The wait is worth it. In my experience, once this shrub fills in, you get dense foliage, spring flowers, and fall berries all from one tough plant. It holds its own for decades with very little work from you after those first couple years of watering.
Read the full article: Arrowwood Viburnum: Complete Growing Guide
