The society has awarded the AGM to more than 200 daffodil varieties. RHS trials manager Andrew McSeveney said: "Gardeners who are looking for great daffodils to grow should really consider those with AGM status.
"The daffodil experts on the daffodil and tulip plant committee have spent a lot of time comparing different varieties so gardeners can be assured that those with AGM after their name are ones that are good for all occasions."
The RHS Advisory Service suggests that for strong and vigorous growth bulbs should be planted before mid September. Planting at different times allows staggered flowering times and extends the flowering season.
It also recommends trying other varieties than the normal yellow trumpet - looking at other colours and shapes, heights and flowering times - such as 'Tete-a-tete', 'Cornish Chuckles', 'Small Talk' and 'Sint Victor'.