The Big Allotment Challenge, produced by Silver River, starts a second series on BBC2 at 9pm on 2 January. Contestants will compete singly rather than in pairs this season. Judge Jim Buttress said he will be more prominent this year.
Sky TV is going into gardening television with Show Me Your Garden, a six-part series on Sky 1 from 2 January 2015 - the same day as The Big Allotment Challenge. Domestic garden owners will compete to prove they have "the best garden in town".
The Great British Garden Revival has a second 10-part series airing on BBC2 from 5 January 2015. Presenters Alys Fowler, Toby Buckland, Carol Klein, Tom Hart Dyke, James Wong, Charlie Dimmock, Joe Swift, Diarmuid Gavin, Rachel de Thame, Chris Beardshaw and Christine Walkden will feature subjects including knot gardens, ornamental grasses, lilies, conifers, pelargoniums, woodland gardens, peonies, daffodils, bog gardens, lavender, wildlife gardens, climbers and creepers, soft fruit, roses, blossom trees and shrubs, scented gardens, tulips, rhododendrons, carnations and irises.
A new three-part series called Britain's Best Gardens begins on 6 January at 8pm on ITV1, with Alan Titchmarsh presenting.
Shopping channel QVC kicks off even earlier than ever before - on 3 January.
During the gardening season, Gardeners' World will return to BBC2 from early March. The BBC will also cover the RHS Chelsea, Hampton Court, Tatton Park and Malvern Flower Shows. Designs on Chelsea is a BBC2 production looking for an aspiring Chelsea designer.
ITV1's Love Your Garden will return for a fifth series, presented by Titchmarsh with David Domoney, from June to August. Producer Spun Gold is still seeking "unsung heroes" looking for a garden makeover.
The Beechgrove Garden will air from 2 April on BBC Scotland, weekly until 15 October, with a repeat in the rest of the UK on BBC network television on Sundays from 5 April in an unconfirmed early-morning slot. Veteran presenters Jim McColl, Carole Baxter and George Anderson will be joined by Chris Beardshaw again.
Monty Don's Secret History of British Gardens has been filmed for the BBC. Raymond Blanc and Kate Humble will present heritage vegetable BBC2 four-parter Kew on a Plate, to be broadcast in late March.
Channel 4 Features has commissioned four hour-long shows called The Autistic Gardener, presented by Alan Gardner from television production company Betty for later in the year.
From late April, Carol Klein will present Carol's Plant Odyssey on BBC2. Producer Oxford Scientific Films has also made The Queen's Garden, presented in two one-hour sections by Alan Titchmarsh for ITV1 for broadcast on Christmas Day and 28 December 2014.