Root growth capacity (RGC) in Scots pine seedlings was studied from the time of sowing and during the following two growing seasons. The method used for measuring RGC is also described. In the first growing season root growth was intense during the period mid‐July to mid‐September with an earlier peak for early sowing dates. After a period of low growth activity during winter, RGC rose sharply in early spring. During periods of intensive shoot elongation in May and June root growth was depressed. After shoot elongation was completed, RGC rose again before declining during the autumn. During winter and the second growing season, higher RGC levels were obtained for seedlings sown in June compared to the ones sown in April. This result is discussed with regard to differences in cultivation regimes.