Larch（Larix kaempferi）is a strong candidate for afforestation after the first harvest in northern Japan. We successfully produced hybrid larch F₁（L. gmelinii var. japonica x L. kaempferi）to overcome the high susceptibly of larch to grazing damages of red-back vole and shoot blight disease. We also improved straightness and strength of stem in larch and developed new propagation methods using the branch cutting method on current-year seedlings. Furthermore, we are now trying to produce container seedlings to realize a low-cost afforestation system. We have been examining the growth responses of hybrid larch F₁ and its parents to several abiotic and biotic stresses for making plantations since larch has a low germination capacity and limitation of planting stocks. We studied the effects of increasing nitrogen deposition and ground-level ozone as rapidly changing abiotic stresses. We also examined the effects of elevated CO₂ and its combination effect with ozone（O₃）and nitrogen deposition. F₁ has high susceptibility to elevated CO₂ and O₃ due to its high growth rate.