The exhibition will visit 16 Trust properties, beginning at Nostell Priory on 24 March and end at East Riddlesden Hall in West Yorkshire on 14 September.
The interactive art exhibition will expand as it goes round the country to 12,000 flowers. The exhibition celebrates "the scale and beauty of our vast plant collections".
The exhibition also looks into how Trust gardens may evolve under a changing climate. Three paintings by artist Rob Collins show how gardens may change over the next century because of climate change.
A Plant in Time will display a vibrant ‘garden' of handmade flowers created by visitors to the exhibition.
Yorkshire and Clydesdale Banks are sponsors, as part of the joint Greener Gardens Initiative "to help make Britain's gardens kinder to the environment".
Nostell Priory, West Yorkshire
Exhibition open: 24 - 28 March
Hidcote Manor Gardens, Gloucestershire
Exhibition open: 31 March, 3 - 7 April, 10 - 11 April
Trelissick Garden, Cornwall
Exhibition open: 14 - 25 April
Exhibition open: 27 April - 10 May
Exhibition open: 13 - 19 May
Sheffield Park Garden, Sussex
Exhibition open: 22 May - 28 May, 1 - 2 June
Exhibition open: 5 June - 16 June
Free drop-in creative workshops: 9, 14 and 15 June
Belton House, Lincolnshire
Exhibition open: 19 - 20 June, 23 - 24 June
Hanbury Hall, Worcestershire
Exhibition open: 26 June - 1 July
Exhibition open: 4 - 8 July, 10 - 15 July, 17 July
Exhibition open: 20 - 22 July
Tintinhull Garden, Somerset
Exhibition open: 24 - 25 July and 28 - 29 July
Lyme Park, Cheshire
Exhibition open: 1 - 8 August
Blickling Hall, Norfolk
Exhibition open: 11 - 22 August
Calke Abbey, Derbyshire
Exhibition open: 26 August - 11 September
East Riddlesden Hall, West Yorkshire
Exhibition open: 14 September