Agapanthus is a glorious addition to the garden, bright blue or white blooms in the height of the summer.  In the Uk climate some areas Agapanthus will tolerate being out in the garden, as long as tyhe plant is well mulched in the winter. Colder areas maybe to cold for the plant to survive outside as it is not completly frost hardy. I have several, two in pots, which are over wintered in the shed, once they go into the shed, they are not watered until the spring. then in the summer they both sprout many flower heads. The other is in a raised bed and is huge. A clump in the region of a square metre in size. It also provides many very large blloms in the summer. How you grow it is entirely up to you.

Agapanthus prefer to be poy bound, they will produce more flowers if this is the case, although after a while Agapanthus will need to be repotted or split into smaller plants. Agapanthus will tell you once it needs a bigger pot, usually it will break the pot if is terracota, or split or deform the shape of the pot if it is plastic Splitting is quite simple, the roots will never be able to be separated, so with a sharp knife, just cut through the roots, ensuring there is a big enough root ball on each plant. It will recover quite quickly.

At the end of the season, cut the flower heads as far back as you can, remove and dead leaves, especially if it is going into storage. In the spring, once the frosts have passed, remove any dead leaves and place back in to its summer postion. 

Agapanthus is actually suprisingly easy to germainate from seed, so when the flowers have faded, then collect some seeds and plant them in some seed compost in the spring. In a few eeks they will emerge and pot them on. The seedlings will grow quite quickly.