"Plant the sides as well as the top"!
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When it comes to the size of your flower basket or in this case we can say the volume of it, well size does make a difference!
The volume of your flower basket is directly related to the amount of water your hanging garden can retain. If you select a basket that is too small, you’ll have to water daily, if not then more often.
Step 2: Insert your liner
To fully cover large flower baskets, you may need to overlap two rectangular sections of liner. While the exact lengths depend on the size of your basket, allow enough extra liner so that, when the flower basket is filled with soil, some of it will still spill over the edges. Over lapping the liner in the bottom of the basket has the added benefit of slowing water flow out of the basket.
Start with a base layer of good quality potting soil in the bottom of your basket. Press it down firmly against the bottom and sides of the basket so that you have a firm background to cut against when making the slits for the first row of plants. The soil level should be about 4 to 6 inches above the bottom of the basket when you complete this step.
Step 4: Insert a water reservoir
To assist with air circulation and watering, insert a vertical 8 to 10 inch section of slotted black drainpipe, available at any hardware store, into your potted soil. Adjust the length so that 2 to 3 inches are exposed above the final soil level. This ensures that the drainpipe does not fill with potting soil during rainfall or while you are watering your plants. To avoid water from draining out of the bottom o your flower basket, place the pipe so that the end sits about 4 to 5 inches above the bottom of the basket. The purpose of inserting this pipe is to direct water towards the bottom of your flower basket, which is the first place that your plant will dry out.
Using a sharp object, make small incisions in the liner just below the current soil level and carefully poke the root-balls of the plants through from the outside. Small plugs or cell pack–size annuals work best because they minimize the size of the openings in your liner; larger holes will let potting soil spill out and may even cause young plants to wash out during watering. If you must use larger plants, gently wash most of the potting soil from the root system and carefully compress the root mass into a torpedo shape and slip it through the liner.
To ensure maximum coverage while preserving visibility, place plants in a checkerboard pattern. After spacing plants evenly in the bottom row, create the next row so that its plants fall between, not directly above, those below.