Green Fingers Festival aims to share the expert knowledge of horticulturists from the Eden Project and elsewhere with talks covering a range of subjects from allotments to exotic ornamentals.
Head of horticulture Don Murray said: "Eden’s great gardening team is looking forward to sharing our knowledge during the festival with lots of talks and demonstrations.
"We’ll be giving visitors real insights into how we manage our spectacular garden, designed landscapes and world-class horticultural exhibits with a particular focus on plants used by people which have become a haven for birds and wildlife."
The gardens have around 9,000 different plants - wild and cultivated, edible and used to produce useable items such as hemp and rubber. Its biomes are two of the largest and best-stocked conservatories in the world.
Professional gardeners from other Cornish gardens, including The Lost Gardens of Heligan and Trebah are also taking part.
Former farm manager at TV’s Jimmy’s Farm, Dave Finkle, TV gardener Toby Buckland and Frances Tophill from ITV's Love Your Garden will also attend.