The shady border rule that slashes your summer water bill

There is always a spot in the garden that does not produce much for its potential. These are either the dark and dusty corners located right beneath the big maple tree or the thin strips of soil located along the sides of the house. One might think that the reason for this lies in insufficient light, thus buying a pack of hostas, watering regularly, and crossing one’s fingers in hopes for the best results. But alas, weeks later, the plants appear wilted and malnourished.The truth is that dry shade is an entirely new ball game compared to shade alone. These locations are not simply about having no sunshine but rather dealing with the scarcity of water. When you have a flower bed underneath an old tree or near a high wall, it means that the flower bed is in a location called a rain shadow. This means that the overhead branches or the roof will serve as an umbrella, directing the raindrops elsewhere.There are plenty of people who make the mistake of thinking that watering will solve the issue. This idea is completely wrong; trying to force nature to produce something completely opposite from the way things should be means losing all your free time during weekends and paying for excessive use of water. Instead of fighting architecture, one should choose plants according to the ground they are going to be planted on.The influence of tree roots and walls on the situationIf you plant some flowers right below the wall of your house or under a huge and strong tree, be prepared to face serious problems. Adult trees are masters at gathering what they need. In most cases, roots of mature trees can be found at a depth of not more than 18-20 inches from the surface of the ground. This place will serve as their battlefield, and your newly planted flowers won't have anything to drink or eat.In a guide on Gardening in the shade, the University of Minnesota Extension explains that while most shade-loving plants prefer moist, well-drained organic soil, maintaining those nutrients is incredibly difficult in these high-competition areas. If you ignore the pressure from nearby tree roots, your new plantings will likely struggle regardless of how much fertiliser you toss their way. The goal shouldn't be to feed the tree; it should be to find plants that can handle the scraps.This issue is further complicated when you include walls or fences in the equation. While the wall will prevent sunlight, it will also hinder the flow of rain and wind. Therefore, while the rain will be pouring heavily outside your fence, the soil around the base of the wall will remain completely dry. Understanding the signs will allow you to avoid watering your plants unnecessarily and develop a garden that looks as easy-going as it is. Resilient plants vs high-maintenance plantsWhat differentiates a successful plant border from an unsuccessful one is your ability to choose resilient plants that do not require constant care to look good. In other words, by opting for plants that thrive in poverty conditions, you avoid the position of a rescuing gardener.The Royal Horticultural Society (RHS), in their research on Plants for dry shade with fiery tints, notes that once these specific varieties are established, they significantly reduce the need for unnecessary watering. They suggest looking for hardy, low-growing evergreens like the Cotoneaster procumbens ‘Queen of Carpets’. This type of plant provides year-round glossy foliage and summer flowers without demanding a gallon of water every time the temperature rises.However, to ensure these hardy plants get the best chance at survival, you still need to consider soil conditions when first planting them. You can also add some organic matter that helps retain any water that manages to reach the soil despite the tree cover or house overhang. You can liken this to having a little “rainy day fund” of water for your plants in the hottest months of summer.At the end of the day, maintaining a neat and flourishing shady border garden is all about being honest with yourself. When you recognise that an area is dark and arid, there’s no need for spending precious hours attempting to grow water-hungry annuals that will never survive in such conditions. Rather, you should work with the natural environment, taking into account the root zone of your trees and rain shadows cast by the walls.