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Planting in a 30" x 12" square container
2 years ago, I bought 3 x 30" x 12" deep containers, because I had heard that clematis likes a cool deep run. All my clematis died. Its evident that the depth of 30" is no good, as probably the watering went straight down to the bottom.
i I have bought some Philadelphus instead (more hardy) but realise that I have to make the planting depth shallower, so am thinking of taking out about 15" of compost, putting some sort of barrier in, sprinkling with water-retentive crystals and planting in my Philadelhus. In this way it would be able to reach the water when I watered. I would love someone to give me some advice or tips about this please. Thanks, Rene.
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What sort of philadelphus, mine have grown to about 15ft tall, they are big shrubs and need to be in the ground. Clematis also like a deep root run, i dont think 15inch is deep enough. You would dig a hole almost that deep to plant one in. They are very hungry plants. 30inch deep would be better, but not for philys. (Unless there is a dwarf one)