The gardening expert will star in a tongue-in-cheek TV advert, on screens from April to May, which suggests Dimmock’s horticultural success is not down to talent, skill or hard work but the judicious use of the planting mix which includes soil improver and nutrients.
Brand manager Rebecca Fairbairn said: "We are delighted to welcome Charlie on board with our quirky and fun TV advert. Our research confirmed that Charlie is much-loved by the entire gardening community.
"Because of this, we felt that she was exactly the right person to promote Planting Magic, a product which gives gardeners of all levels and abilities amazing and long lasting results."
The advert featuring Dimmock, who came to prominence in popular 1990s TV show Groundforce which also featured Tommy Walsh and Alan Titchmarsh, will be seen by more than 17 million consumers nationwide.
Planting Magic is aimed at strong root growth and contains water-storing pockets to keep plants looking lively all season long, according to manufacturers Westland Horticulture. It can be used with all types of plants.
Gro-Sure is spending £1.5 million in all on TV and press advertising.