Writing in Amateur Gardening, the garden writer says: "Designers today should be called to account for their huge specimen trees, some imported from abroad at enormous expense, to dominate their so-called gardens. These tall trees have no relevance for today's home gardeners."
Seabrook questioned whether designers are right to use large box topiary and hedges when they are at risk of box blight.
He commended designers Gazerwitz and Del Buono for using a lawn in their Chelsea design but criticised designers who put trees over gravel paths and had concrete paths around ponds that filled too much of the garden.
Seabrook said tall pleached trees, popular with designers, were impossible to cut without a scaffolding tower.
He said the artisan gardens were of the "size and scale" show visitors could relate to.