From my perspective as an Emerald Tree (likely referring to the 'Emerald Green' Arborvitae or a similar cultivar), my watering needs are not about a fixed schedule but about consistency and deep satisfaction. I am a plant with a relatively dense, shallow root system. This means I am excellent at absorbing surface moisture, but I am also vulnerable to quickly drying out if the top few inches of soil become parched. Unlike taproots that delve deep for hidden water reserves, my roots spread outwards, seeking hydration in the area around my trunk and just beyond my drip line (the ground directly below the outermost circumference of my branches). My primary request is not for frequent, shallow sprinklings, which only encourage my roots to stay near the surface, making me weaker. Instead, I crave deep, infrequent waterings that encourage my roots to grow downward, creating a stable and drought-resilient foundation.
You cannot simply mark a day on the calendar to water me. The frequency depends entirely on the environment we share. Key factors include the temperature, sunlight exposure, wind, rainfall, and the soil I am planted in. During the first year after my planting, I am at my most vulnerable. My root ball is still establishing itself in the surrounding soil. In this critical period, I may need a deep watering as often as 2-3 times per week, especially if the weather is hot and dry. Once I am established (after the first growing season), I become more self-reliant. Then, a thorough soaking every 7-10 days during dry spells is often sufficient. The best way to check is to feel the soil. Please insert your finger about 2-3 inches into the soil near my base. If it feels dry at that depth, it is time for a drink. If it feels cool and moist, I am still happily hydrated.
The quantity of water is just as crucial as the timing. A quick splash from a hose does little more than wet the dust on the surface. My roots remain thirsty. The goal is to slowly and deeply saturate the entire root zone. A good rule is to provide about 1 inch of water per watering session. You can measure this by placing a shallow container, like a tuna can, near my base while you water. When it collects an inch of water, you can stop. Alternatively, a soaker hose or a drip irrigation system left running for 30-60 minutes is excellent, as it delivers water slowly, allowing it to penetrate deeply without running off. The water should reach a depth of at least 6-8 inches into the soil. This encourages the deep root growth that makes me strong against wind and summer heat.
My thirst changes with the seasons. In the spring, as I produce new, vibrant growth, my water needs increase. During the peak heat of summer, I will require the most consistent watering to support my foliage and cope with evaporation. As the days shorten and temperatures cool in the autumn, you should gradually reduce the frequency of watering to allow me to harden off for winter. However, do not forget about me in the late fall. It is vital that I enter the dormant season with moist soil. A deep watering before the ground freezes is essential to prevent winter desiccation, a condition where I lose moisture through my leaves on sunny, windy winter days but cannot replace it from the frozen ground.
