Looks like a Dracaena, massangeana or fragrans. This discussion may be relevant. Different plant, but almost identical in regard to pruning/propagation.

First of all, I must say you have chosen a house with a lovely garden. Congratulations on your new home. For i.d. purposes it is best to have a close up of just one plant per photo so that we know what we are talking about, but I will have a stab at a few of them. The low variegated ground cover is a Lamium sp. The small plants with white flowers are Vinca. The three round shrubs are probably Box. The white flowers behind them are Hydrangeas. The white daisy flowers near the gas? meter are Shasta daisies. The shrubs near the pink bird feeder might be Azaleas. The large leafed variegated plants are Hostas. Please post more photos when you can! Cheers, Dee.

The last two remind me of herbs. Second to last looks like some kind of basil, and the last might be a mint... like spearmint or catnip. Easy to tell by rubbing leaves and sniffing.

Spikes are not the best way to go. If there is a need to use ferts, use something you broadcast or water in for better coverage. tj