The Which? article said consumers could be paying 100 times too much on grow-your-own comparing the cost of Gardening Direct's £1.09 plugs, each producing a single carrot or beetroot, with the price of a packet of seed.
Gardening Direct marketing manager Mark Sherwood said: "The Which? Gardening article highlighted our 'Autumn King' carrot package as an expensive option for novice gardeners at £6.99 plus postage for 10 plug plants. While we believe that our premium quality plug plants normally represent outstanding value for money, we do not wish to mislead gardeners in any way nor be perceived as being poor value for money."
"For this reason, we have withdrawn our carrot plug plants from the market along with our Beetroot plug plant varieties with immediate effect. We will continue to review our vegetable plug plant range to ensure that we offer gardeners of every level of expertise great plants at a highly competitive price."
Which? also pointed the finger at Thompson and Morgan carrot plugs priced at 14p per carrot, saying they offer poor value for money when compared to vegetables from seed.
Thompson and Morgan, Suttons and Dobies all sell beetroot plug plants at between 47p and 55p.
Which? Gardening editor Ceri Thomas said: "Carrot seed is really cheap to buy and very easy to grow — even for novice gardeners. Plug plants are a great option for slow-growing or tricky-to-raise crops, but we wouldn't recommend them for vegetables that can be easily grown from seeds. Plug plants for carrots and beetroot are a complete waste of money."
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