An excellent way to extend the flowering season in a meadow is to introduce In the Green Bulbs. This can work in particularly well where you have semi shade or shady areas.
These extend the season from January through to May then the meadow flowers should start to come to the fore from then.
The picture below is a good example of some snowdrops we supplied to Kelly Marks of Intelligent Horsemanship. They were planted last spring and now each year come into flower early in the year.
We now have available stocks of all three in the green Bulbs species.