Since nobody else is bothering to post much I will show my giant sun flowers...
Here is late in April when they are small:
Here they are now:
Nice start. What part of the country/ zone do you live in?
South Central Kansas - Zone 6b
I attempted to grow some Mammoth Sunflowers last year and failed. It just got to hot and dry. I also think I didn't prepare the soil well enough.
Good luck and keep us updated.
Here is an update for 5/19/2012
Here is a link that might be useful: Youtube Video
They are looking great! I'll have to check out the sunzilla seeds and try going them sometime. Keep us posted!
Here is a June 1st update. See the link.
Here is a link that might be useful: Video Update
Here is another update! Most of the flowers are open now. They are growing new sets of leafs and buds along the stems now.
Here is a link that might be useful: June 5th Video Update
Really, really nice. Be sure to post another pic when the others open.
I've got two Mammoths going, no flower yet but they are abut 6' high.
Here they are going to seed.
can we start sunflower seed inside and how early