Using fresh, good-quality compost, plant bulbs in pots from September to   November. For borders, we advise waiting until after the first frosts  (typically mid-October to early December depending on your location) to reduce  the risk of potential disease such as Tulip Fire. Plant bulbs 15-20cm (6-8in)   deep and 10-15cm (4-6in) apart in fertile, well-drained soil. Alternatively,   allow 7-9 bulbs per 30cm sq or 60-75 bulbs per m².  If you’re unable to plant   your bulbs immediately, they can be stored in a cool environment with good air  circulation. Remove all the packaging and place them in a loose-weave jute   sack before labelling and hanging up in a dry, unheated garden shed or  well-ventilated greenhouse.
 In spring, when the plants are in active growth, apply a high-potash fertiliser  (like Tomorite) each week until the leaves start to die back. Pinch off the   spent flower heads as the petals fall, and let the stem and foliage die back   naturally. The bulbs can then be lifted and discarded, or cleaned, dried and   stored (as before) for replanting the following autumn.