I grow several types of Meconopsis. Most of them need dividing now and then, or else they die on me. The best time to do this is early spring or in August. I like to do it in spring. I'm usually a bit late. This is how I do it: Preparation: Find the tools you need. I use a small spade, scissors and a knife. Find the rudest kids in the neighbourhood and learn some new swear words. You will need them. Carefully dig up the clump. I usually put them on a plastic sheet or a big piece of carboard to see what I'm doing: Start by carefully separating the rosettes by pulling them apart, using the spade, scissors, or the knife if necessary: When you realize this is going to be nigh on impossible, use the words you learned from the neighbours' rude kids, start tugging at and shaking the clump. Throw the tools in a tantrum fit, but please do not do what I did. It went well. No windows or scissors were damaged in the process: Once you've managed to separate the rosettes you will have a bad conscience and a few broken leaves. Apologize to the plant, assure her you love her, cut the broken leaves off and start praying to your chosen patron saint of gardeners, i.e. St. Dorothy or St. Fiacre. St. Frances of Assisi will also work: Choose the right kind of soil for the Meconopsis, or mix it yourself if you can't find it in the nurseries. They like humus-rich but well-drained growing conditions. My soil is slightly acid. Carefully plant the rosettes with enough space around them to develop. Keep on apologizing while whispering sweet words.Pray some more: Water well and add soil if needed. Remove the leaves you broke while planting. Keep on praying! After some time you may enjoy the result of your efforts. Meconopsis may be a lot of work but they're definitely worth it!