Not labelling and not watering new plants in pots. New plants are so near the outside tap but not in sight from the kitchen window, well that's my excuse!
The biggest gardening crime people commit here is extreme pruning of lagerstroemia, known as "crape murder" (google the phrase if you dare) in late winter.
My own biggest gardening crime is attempting too many plants that need sandier soil than I can provide. I've lost so many - agastache, stachys, salvia, allium, scabiosa, penstemon to name a few. In my defense, I live just north of a fall line; the soil type just a few miles south of me (in a much bigger city) is much sandier. As a result, most of the GCs carry plants for those conditions.
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That describes the norwich council approach to planting trees unfortunately.
My own biggest gardening crime is attempting too many plants that need sandier soil than I can provide. I've lost so many - agastache, stachys, salvia, allium, scabiosa, penstemon to name a few. In my defense, I live just north of a fall line; the soil type just a few miles south of me (in a much bigger city) is much sandier. As a result, most of the GCs carry plants for those conditions.