The widespread recent expansion of deciduous shrubs across much of the Arctic has been attributed largely to climate warming. Increases in net shrub growth have the potential to create large-scale climate feedbacks, including enhanced CO2 release from Arctic soils (due to shrubs trapping snow and insulating soils over the winter). Understanding the intensity and distribution of Arctic shrub expansion is therefore necessary to predict future climate patterns. This study examines growth-rates of a deciduous shrub (Dwarf Birch, Betula glandulosa) at a central low Arctic site (Daring Lake, NWT). Direct measurements of shrub land-cover and stature in 2016 were compared with corresponding 2006 data for five representative birch habitat-types across the landscape. These growth-rates, as well as dendrochronologically-based annual growth-rates, were evaluated in relation to habitat-type environmental characteristics and 20-year climate data. Birch height, dimensions, and land-cover all increased 20-25% over the last decade, in all habitat-types. However, a lack of correlation between annual climate and annual secondary growth, limited warming at this site, and uniformity in growth-rates among habitat-types, together indicate that warming is not the driving factor. Instead, it is likely a release from herbivory following recent caribou herd declines driving shrub expansion at this site. Individual shrub growth was correlated to soil nutrient flux (particularly of ammonium), but the latter was highly variable within and across habitat-types, suggesting that fine-scale variability in nutrient supply is more important than habitat-scale variability in determining birch growth-rates following herbivory release. This observed net shrub growth indicates that caribou herd declines may be driving shrub expansion in lieu of strong warming in the Canadian central low Arctic.