pods of blooming flowers on a kiri paulownia tree in the castellana madrid spain

absorb alien species amounts applications atmosphere benefits bloom carbon dioxide castellana chinese tree city botany close view co2 common cultivate deciduous empress environment friendly europe exotic fast growing fastgrowing foxglove foxglovetree greenery hardwood horizontal introduced invasive kiri large logging naturalised paulownia tomentosa paulowniaceae pod pods pollution princess reforestation shoots sprout sustainable valuable versatile white blooms