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In general for most vegetables you want at least 12 inches deep, for tomatoes and large squash 18 inches deep, for herbs and small flowers 8 inches deep. Longer and wider is always better because the soil stays more evenly moist (up to 8ft long x 4 ft wide for raised beds and 8ft long x 3 ft wide for boxes).
An alternative technique is to bury duct and blow cables into the ducts as is done in underground installations. Typically trunk cables in most areas are installed 3-4 feet deep (1-1.2 m), but in residential or urban areas, cables may be buried only 2 feet (0.6 m) deep.se of Innerduct It may be prudent to install critical indoor fiber optic cables inside bright orange âinnerductâ to ease cable installation and protect it from future damage. Bright orange innerduct will identify fiber optic cable to any workers at a later date and possible prevent damage.