flower boxes - Knowledgebase Question

Mesa, AZ (Zone 8B)
Question by SUZBRINCKEN
April 18, 2007
i bought large flower boxes and am going through so much potting soil by filling them with it. Is there any other solution to planting the flowers in a deep container without using so much soil?


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Answer from NGA
April 18, 2007

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It depends on what you are planting in them. Most of the root systems of annuals, perennials, cacti and succulents are in the top 12-16 inches or so of soil, so you need to make sure they have at least that and a little more. Because plant roots are confined to the container, which heats up considerably in summer, it's important to make sure they won't "cook." If your pots are considerably deeper than that, I know a container gardener who places styrofoam peanuts in the bottom of large pots. If you are planting, for example, shrubs or a dwarf citrus tree, their deeper root systems need the deeper soil base that a big pot offers. Good luck with your containers!

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