Orchard Nurseries supplies retailers including the Garden Centre Group and Marks & Spencer, while Suttons, Thompson & Morna, EW King, Unwins and Mr Fothergill are expected to have the seed mix in their catalogues this September.
Last year's Help for Heroes Petunia made more than £20,000 for the charity when sold through B&Q in less than a week and Simply Sweet Peas hopes the sweet pea will better this.
Simply Sweet Peas representative Richard Massey said: "The conception was a joint effort between ourslves and Peter Seabrook at The Sun.
"At the show a bouquet of the Hope for Heroes mix was presented to HRH the Duchess of Cornwall.
"Orchard Nurseries grows over 30m sweet pea plants annually for the garden trade and we expect Hope for Heroes to feature strongly in our offer next year.
"Seeds are now available on our website www.simplysweetpeas.co.uk. Sales here and at Sandringham have already generated several hundred pounds for the charity."
The mix contains red, pale blue and dark blue varieties to represent the army, air force and navy.
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