How much do lilium bulbs cost and what stem yield should I expect per square metre?

Lilium is a high investment crop because the bulbs are imported and costly per bulb, and that bulb cost is your biggest single expense, much more than the structure on a per crop basis. Each bulb generally gives one main flowering stem, and planting density is commonly around 40 to 60 bulbs per square metre depending on bulb size, so your stem yield per square metre is roughly tied to that bulb number. Because the bulb cost is high and the rate is variable, your margin depends on getting a good stem grade and a strong sale price, which means hitting the right market window. Get a current bulb price quote and confirm the recommended density for your variety with the supplier and KVK, and check market rates before committing, since the bulb cost makes this a higher risk crop than seed based flowers.