Pollen, to cross pollinate with.
Cross pollination, the pollen from one variety is brushed onto the carpel of another variety.
After some weeks the carpel starts to grow, then it's a matter of time until the seeds are ready.
1 year old seed, they are tiny shoots that have grown a little buld.
The second year, they grow a little each year.
The 3rd year, this is where the first ones start flowering.
In the 4th year all the tulips will flower, and a selection can be made. After this year the bulbs will go outside to be planted.