The Q&A Archives: landscape shrubs are yellowish and some have died

Question: our shrubs are 10 years old and we have added additional yews 5 years ago. some have died we believe because they get too much water from the down spouts. Now the 10 year old shrub are yellowish and turning brown. Would this be caused by downspouts that have been connected to underground drainage that is keeping the soil too wet? 1) redirect the drainage, 2) what can we do to save the remaing?

Answer: It sounds as though you are pretty certain that there is a drainage problem that is affecting your shrubs. If this is the case, installing a French drain will certainly help redirect the runoff and keep your plants a lot healthier. The French drain is a time-honored system for eliminating excess water from low points and other areas prone to saturated soil. French drains are quite simple: in essence they are just trenches filled with gravel, with sand on top of that. Often, you'll see French drains defined to include a drain pipe as well, though the traditional design is simply the gravel-filled trench. The advantages of French drains are low cost and easy installation. In addition, they can be covered over with turf after installation, making them less conspicuous. A French drain starts with digging a trench. The depth and width of the trench can vary, but 5 to 6 inches wide and 8 to 12 inches deep are common sizes and usually satisfy most needs. Grading is a critical consideration ? you must ensure that enough slope exists for the water to actually flow, and flow in the right direction. It might be adequate to check very short stretches of drain with a level to ensure that a slope exists to carry water in the desired direction. However, you should take whatever measures are necessary, including a survey and grading, if needed, to ensure that you have at least a 0.5 percent slope. A 1 or 2 percent grade is better. Add gravel to the trench to within a few inches of the surface. Gravel for this use is typically 0.5 to 1 inch in size. On top of the gravel, lay at least 3 or 4 inches of coarse sand. This provides a medium in which turf can grow so that the trench will not be visible. But remember that the sand must be coarse or it won't allow water to properly drain through. HOpe this helps save your shrubs!

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