It is worth spreading the seeds of Narcissus pseudonarcissus, being a species and not a hybrid, they come true from seed and you only have to wait about 4 yrs. When they first come up, I have to be very careful not to pull them out as they look just like grass. When the slnowdrops are over, the narcissus take over and the the fritilleria meleagris take over, making lots of colour from this area for more than 3 months.