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.