Gardeners can feel hugely disappointed when they take the time to plant seeds that never flower, but new research reveals that they may not be doing anything wrong.

According to Gardening Which? a number of top seed retailers sell packs containing dead seeds.

Ceri Thomas, editor of Gardening Which?, said: "Most gardeners naturally blame themselves when seeds don't develop into plants, but our tests show many seeds are dead in the packets before they're even sewn.

"How disheartening for any gardener to put time, effort and love into growing plants from seed, for only a handful to make it.

"We hope our report will shame the seed suppliers who scored badly into reviewing their quality control."

Nevertheless, the watchdog claims that a number of colourful plants can still flourish in the cold weather.

Fruit plants that can grow in shady areas include rhubarb, redcurrants, gooseberries and plums.

For planting advice, visit Planting Up.