In our collection we have four yellow cultivars of Galanthus plicatus. Here is a description of them using Snowdrops A Monograph of Cultivated Galanthus, so prehaps you can tell them apart in future. One little thing to note is that the yellow colouring of these snowdrops can vary depending on your soil type.
Galanthus plicatus 'Bill Clark'
New to our collection in the past couple of years, I am yet to take a decent image. Taller than 'Wendy's Gold', with pale to mid-green leaves, the flowers are nicely shaped and held on scapes that rise well above the leaves. The inner segment marking is a perfect solid yellow circle with just a small notch missing where it sits above the sinus.
Galanthus plicatus 'Madelaine'
Is one of the most vigorous of the yellow snowdrops, flowering mid-season with nice fresh green leaves. It has yellow-tipped inner petals with a greenish-yellow ovary.
Galanthus plicatus 'Wandlebury Ring'
This cultivar was chosen in 1991, after carefully selected crosses of 'Wendy's Gold' with other yellow snowdrops by Bill Clark. It's strong scapes make it taller than 'Wendy's Gold'. With its flowers hanging from a yellowish pedicel we have found it has bulked up quickly.
Galanthus plicatus 'Wendy's Gold'
With the largest area of yellow on the inner segment of the plicatus cultivars, the colouring can vary depending on your soil type. 'Wendy's Gold' has a tendency to not grow into tight clumps but spread themselves apart. We have a few clumps from different sources, but the bulbs that give us the best colour came from Margaret Owen's The Patch in Shropshire.