How should I water newly planted trees and shrubs in New Brunswick?

Newly planted trees and shrubs in New Brunswick need deep, consistent watering for their entire first growing season and reduced but attentive watering through their second year, as establishing a healthy root system in NB's variable climate is the single most critical factor in long-term survival. The root ball cannot yet access moisture from surrounding soil, meaning it can dry out even when the rest of your garden appears moist.

During the first 2 weeks after planting, water daily if there is no significant rainfall. Apply water slowly and deeply directly to the root ball and the soil immediately surrounding it — a slow trickle from a garden hose laid at the base of the plant for 15-20 minutes for shrubs and 30-45 minutes for trees is more effective than a quick spray. The goal is to thoroughly saturate the root ball and encourage water to penetrate into the surrounding native soil, enticing roots to grow outward. In NB's sandy coastal soils near Moncton, water drains quickly and you may need to water more frequently; in the heavier clay soils around Fredericton and the Saint John River valley, water less often but check that the root zone is not staying waterlogged.

From weeks 3 through 12 (roughly the rest of the first growing season), water deeply 2-3 times per week if rainfall is insufficient. A general rule is that a newly planted tree needs 10 gallons of water per inch of trunk diameter per watering session — so a 2-inch caliper maple needs about 20 gallons each time, delivered slowly over 30-45 minutes. Shrubs need proportionally less based on their root ball size. Check soil moisture before watering by pushing your finger 3-4 inches into the soil near the root ball — if it feels dry at that depth, water thoroughly.

Gator bags (slow-release watering bags) are an excellent tool for newly planted NB trees. These 15-20 gallon bags zip around the trunk and release water slowly over 6-8 hours through small pores at the base, providing consistent deep watering without runoff. They cost $15-30 each and are particularly valuable during NB's July-August dry periods when consistent manual watering is difficult to maintain. Fill them 1-2 times per week depending on rainfall and temperature.

Mulching is essential alongside proper watering. Apply 3-4 inches of shredded bark mulch in a ring extending 2-3 feet from the trunk (keeping mulch 3-4 inches away from the trunk itself). Mulch reduces soil moisture evaporation by 50-70%, moderates soil temperature, and prevents freeze-thaw soil cracking that can damage newly established roots.

Continue attentive watering through the second growing season, reducing to once per week during dry periods. Most trees and shrubs planted in NB are not fully established until their third year, though they require less intervention after the first season. Water deeply in late October before the ground freezes — fully hydrated trees and shrubs are far more resistant to NB's winter desiccation, which kills more newly planted stock than the cold itself.

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