In a recent UK TV programme it was implied that planting bulbs deeper than "normal" discouraged bulbs from increasing by side bulblets, and consequently gave larger flowers and continuing flowering in subsequent years. In this case large flowered tulip hybrids were the example. The commentary I think said "deeper planting, equals cooler bulbs, larger flowers, longer bulb life", though presumably less bulb increase. Is this "cooler bulbs point" a valid argument for bulbs like tulips, or indeed bulbs in general? E.g. some reticulate irises which split up much more readily than tulips in my experience. Brian Whyer, zone 8'ish, Buckinghamshire, England.