Sunflower Growth ( and Death)

Sadly, my first post about my sunflower is to actually detailing its death.  

Initially, the plant seemed to be doing well.  I didn't have it in natural sunlight but it still seemed to grow In the first two weeks, the two seeds I planted grew above ground and attached to two stems, the largest of which grew leaves. However after the two weeks point, all growth stopped.   I moved the plant into direct sunlight so that it might stimulate growth.  But sadly, it never grew again.  After 5 days, the smallest stem weakened and started to droop under the weight of the still attached seed.  With days, the green stem was brown and the seed was resting on the soil.  The remaining stem did not die but showed no signs of growth over the next week.  On Friday, I terminated the plant.  What remains of my month long endeavor can be found below.

I have planted new seeds in my cup and hopefully, new life shall rise.  I have not seen any growth yet but it has only been a few days.  This time around, I plan to keep it in natural light from day one.  I feel like this greatly affected for the worse its growth last time.  Now, from its ashes shall rise a stronger and mightier plant.