Pic's blurry (was it windy?) but that looks like maybe its Euphorbia Tasmanian Tiger - if it is, or another of the Euphorbia characias varieties, the procedure for pruning is simple. Cut down to the soil all stems which have flowered this year, taking care not to damage any new growth elsewhere; this type of Euphorbia puts out new stems from the base which will flower next year, so the ones from this year are redundant. If it hasn't flowered yet, wait till it has, then do it.

Wear gloves - the white sap from these can cause dermatitis.

Thank you ...here's another photo if it's better

Not really any better - it looks like its almost finished flowering, but I can't really tell.

Thanks. ..I have gone ahead and cut out the older spikes as you suggested and it looks much better.