?Firmiana simplex, called chinese parasoltree is an upright small tree with an oval crown reaching up to 30 to 40 feet tall. Alternate, simple, very large 3 to 5 lobed leaves (often maple looking), 8 to over 12 inches long and wide, very long petiole, bright green above, often fuzzy beneath.Flowers are large (12 to 18 inches), upright, loose, terminal clusters of yellow-green flowers, appearing in mid-summer.  
Please use for sowing Jiffy 7 Peat Pellets, soak them in water and put in a plastic pot.
Alternatively, normal seed substrate could be used as well.

Sow the seeds on the peat pellets and cover the seeds with a thin layer of peat (about 2 mm).

Then put the plastic pot in a zip-lock bag - with a pot size of 6 cm , a zip-lock bag of size 12 x 17 cm is recommended . Fill in the zip-lock bag as much tap water with a few drops of universal fertilizer, so that after the absorption of the substrate a few mm of water remain on the bottom. 

Location: on the windowsill or in a small greenhouse in partial shade, daytime temperatures at about 75-83 F, somewhat lower at night at 68-75 F. 
price is for 5 seeds