To grow lemons, first dig a hole in the soil wide and deep enough to hold the roots of your tree. Next, place the tree into the hole and restore two thirds of the removed soil and water the tree systematically, until the soil is moist. This may require you to water the tree daily. Wipe the lemon tree leaves down at night with a soggy sponge. Thirdly, apply pollen on the branches and leaves of indoor trees with a cotton pad. Finally, remember that trees planted outdoors will be naturally pollinated by bees and other insects.