Globe willow trees grow 3 feet per year, reaching a height and canopy spread up to 70 feet, with a lifespan of 40 to 150 years. The branches and bark are yellow when trees are young, maturing to a smooth olive-green. Some globe willow trees have been known to reach a trunk circumference of 150 inches.Click to see full answer. In this regard, how do you care for a globe willow tree?Irrigate once every 10 to 20 days or so (depending on soil water holding capacity) and apply the water in the zone outside the drip line during the growing season. In areas of high levels of salt (sodium and calcium salts) in the soil and water, the globe willow will not grow well and other trees should be used.Similarly, how do you prune a globe willow tree? Cut back branches that extend beyond the naturally rounded shape of the canopy. Always cut just beyond another branch or bud. If the tree does not fill out well as it grows, or there is extensive dieback, branches can be tip-pruned, cutting just beyond a twig, bud or leaf, to encourage the tree to fill out. Then, why is my willow tree dripping sap? Answer: The problem you described on globe willow is very likely slime flux as you suspect. This bacterial disease of trees is also known as “wet wood” disease. If the dripping sap is causing problems on the lawn or surfaces below the tree, the offending material may be washed away with a strong jet of water.Where do willow trees grow best?The weeping willow grows well in acidic, alkaline, loamy, moist, rich, sandy, well-drained and clay soils. It grows well near water but has some drought tolerance.