Posted: 12/05/2013 at 18:44
I have just been reading Sarah Raven's guide to growing tulips.
Her recommendation is to plant deeply, and by deeply we are looking at a 12" hole with 2" of gravel for drainage and a bit of bonemeal. This is done October/November and then, after flowering, the old leaves are cleared away and the patch mulched.
She claims that there is no advantage to lifting tulips and that shallow planting encourages the bulbs to try to divide and thus weaken themselves.