Currently we are in a severe drought and plants that are 2 -3 years old will also need watering, along with any new plantings. Mature trees could also benefit from some watering. It is suggested an inch of water per week would be best. Evergreens do not wilt like other trees do, so they will not show signs of needing watering, but they do. In particular, Arbor Vitaes always need watering during hot, dry summers. It is best to water early in the morning or later in the evening, once it has cooled down. Water around the base of the plant, do not spray the leaves on the trees; when it is hot, water on the leaves could scorch them. Remember, leaves do not absorb water, the roots of the trees do!