Following this there will be Harvey's annual ‘Celebration of Snowdrops’ – A chance to see and buy rare Galanthus and get expert advice from renowned collectors from 11:30am to 2:30pm.
Harveys Garden Plants in Bury St Edmonds in Suffolk is holding a sale of rare species and cultivars on 30 January.
Collectors Glen Chantry, Richard Bashford, John Foster, Michael Broadhurst, Avon Bulbs and Valentin Wijnen will also be involved. Three rare bulbs from Wijnen's collection will be offered at 1pm.
Talk & Entrance Fee £22.50, Celebration of Snowdrops Only Entrance Fee £2.50 with 20 per cent discount for RHS Members.
Owner Roger Harvey said: "The plants are about three weeks earlier than usual, up to now.
"Snowdrops that normally flower in January were flowering before Christmas, and hellebores that flower in late Jan/Feb were in full flower at the beginning of January. I have not seen this for 10 years or more. Usually we struggle to get them into flower for The Snowdrop Day 30 Jan, and even the RHS Feb show in mid Feb.
"Some of the Winter aconites have finished flowering and thus will not be in peak condition at the end of Jan.
"Also I have just picked Rhubarb, for our restaurant although only up to 12 inches stalk length. This is fine, I have never done this before. Frosts will kill these early stems.
Obviously the cold weather this week will hold the snowdrops and hellebores already in flower."