Don't divide them. Asperagus take years to grow well - you are almost there. But well grown Patches are 20 or 30 years old. Leave the ferny stems until they turn completely yellow and then you can cut them off at ground level.
The little red seed pods are future plants waiting to happen. You can gather them and sprout them in pots or just push them down into the soil and wait.
Next spring, as the stems emerge, you can cut any that are fatter then a pencil - those are your asperagus spears. Cut them as close to the soil level as possible when they are 8 - 10 inches tall but remember, once the spears start to open, its too late so leave those. You can continue to harvest the spears until none of them are bigger than a pencil. Then just let everything grow until next fall when they turn yellow again.
If you want to plant more asperagus plants, start planning now for next spring.
