Answer
What garden jobs are best done in spring?
Planting and turfing, and the start of the build season; design over winter to be ready.
In short
Spring suits planting and turfing, as roots establish before summer, and it is the start of the main build season. It is also the time many people decide to act, so it books up fast. Designing over winter means you are ready to build the moment spring arrives.
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