About 1 to 2 inches below the rim of the planter box. 6-to 8-inch deep
A planter box needs to be at least a certain depth so that the plants inside can grow to their full length. Find out how deep a planter box must be to grow carrots with help from the owner of Eden Condensed in this free video clip. Expert: Angela Price. Filmmaker: Nick Brosco.  Perennials, like bulbs, require a deeper planting box depth. Large bulbs require a planting depth of 8 inches, which means the planter box should allow for the 6 inches needed at the bottom, as discussed earlier, making the depth at least 14 inches. Most smaller bulbs are planted at 3 to 4 inches deep, so they would do fine in planter box with an 8-inch Choose well-draining planter boxes to grow your vegetables in. All types of vegetables need well-drained soil in which to thrive. Without drainage, the vegetables will get root rot and die. Also, planter boxes should be between 1 gallon and 3 gallons per plant so the vegetable's roots have enough room to grow. Planning & Advice. How deep (or tall) a raised bed should be depends on the rooting depth requirements of the plants you wish to grow, and whether the ground below the planter is made of healthy soil. Shallow rooted plants such as lettuces, greens, annual herbs and most flowers can be grown in planters 11 to 16.5 inches tall, though even these plants may grow larger if given more soil. Taller planters also provide easier access and reduce the need for bending over. Step 3. Fill the planter boxes 2/3 full of potting soil. Dig a hole in the soil deep enough to accommodate the vegetable's root ball. Make sure the crown of the plant is about 1 to 2 inches below the rim of the planter box. Place the vegetables into the holes and fill the planter with potting soil until it is 1/4 inch higher than the crown of the plant. All types of vegetables need well-drained soil in which to thrive. Without drainage, the vegetables will get root rot and die. Also, planter boxes should be between 1 gallon and 3 gallons per plant so the vegetable's roots have enough room to grow. Quantity of Planter Soil. Once you have determined the planter depth and plant spacing for a particular crop, you can calculate how much planter soil you will need. Simply multiply the soil surface area by the planter depth, then multiply this result by the number of plants you intend to grow. For example, say you are growing onions on 4-inch by 4-inch spacings in an 8-inch-deep planter. Each onion requires 16 square inches of soil surface (4 x 4), and 128 cubic inches of soil (16 x 8). If you want to grow 20 onions, you will need 128 x 20 = 2,560 cubic inches of soil. Planter Depth. If possible, grow all your vegetables in planters that are 12 inches deep. This will be generous for smaller crops and adequate for larger crops, and deeper planters will require less attention to irrigation. Some plants will grow well in shallow soil that does not drain well. But for most plants--particularly flowering plants and vegetables--the deeper and better draining the soil is, the better they will grow. So the deeper the planter box, the better the plants inside will grow. (Stockbyte/Stockbyte/Getty Images). Some vegetable plants will not take well to a planter box. A rule of thumb is to provide plants with enough space to mature properly in all growing directions. The root growth, in many respects, is more important than the upward growth, because without healthy root growth, the plants will not grow. For most plants, a 6-to 8-inch-deep planter box is sufficient. The depth may vary for some vegetables, however. Turnips, cucumbers, broccoli, beets, lettuce and green onions can all grow well in a planter box at that depth, but other vegetables, like cabbage, need a deeper depth of at least 10 inches. Large bulbs require a planting depth of 8 inches, which means the planter box should allow for the 6 inches needed at the bottom, as discussed earlier, making the depth at least 14 inches. For best results, there should be another 12 or more of good soil below the bed. This gives your plants at least 18 - 20 of soil. (The soil in raised beds is usually a few inches below the rim of the bed. This is because.soil compresses after several waterings.  Free Shipping. How deep (or tall) a raised bed should be depends on the rooting depth requirements of the plants you wish to grow, and whether the ground below the planter is made of healthy soil. Shallow rooted plants such as lettuces, greens, annual herbs and most flowers can be grown in planters 11 to 16.5 inches tall, though even these plants may grow larger if given more soil. Taller planters also provide easier access and reduce the need for bending over.
http://www.youtube.com/watch?v=8Dyv7JcI_Rw http://homeguides.sfgate.com/deep-make-planter-box-48527.html http://www.gardenguides.com/118392-grow-vegetables-planter-boxes.html http://support.naturalyards.com/how-deep-raised-beds/ http://www.gardenguides.com/118392-grow-vegetables-planter-boxes.html http://homeguides.sfgate.com/much-soil-needed-grow-vegetables-planters-48261.html http://www.ehow.com/way_5873080_deep-make-planter-box.html http://homeguides.sfgate.com/deep-make-planter-box-48527.html http://eartheasy.com/raised-beds-soil-depth-requirements.html http://support.naturalyards.com/how-deep-raised-beds/
how deep should soil be to plant vegetables in a planter box?