Growth and Development of Paulownia tomentosa and Paulownia elongata x fortunei in Glasshouse Experiment

The growth potential of Paulownia tomentosa and Paulownia elongata x fortunei, cultivated at three planting densities in a greenhouse was investigated, using conventional field and laboratory methods. Data on the survival percentage, base diameter, total plant height, biomass and leaf area were obtained and analyzed. Differences in growth, productivity, survival and biomass allocation pattern of the tested clones of Paulownia tomentosa and Paulownia elongata x fortunei were found. The results obtained showed that hybrids of Paulownia elongata x fortunei do not exceed the growth performance of the Paulownia tomentosa species for the region of Sofia.