I am new to bonsai in fact, I have no bonsai tree's over the age of about 1 month. Funny, in my attempt to grow a Japanese Katsura from seed I had left one of my seeding pots outside. I came out to bring it back inside and saw a load of cotton seed stuck to it as the stuff was very prevalent in the wind that day. I picked it all off (or thought I did) and about 2 days later I noticed a little sprout. I almost pulled it but then I thought... what the heck, and I transplanted it into its own container.
So, now I have a little cottonwood tree sprout growing and I think I want to try and make it into a bonsai. So my question is:
Has anyone here made a cottonwood bonsai before and if so, any tips? Also, how long should I wait to plant this outside and how long should it stay there growing?
USDA growing zone: 4b-5a
The Köppen Climate Classification subtype for this climate is "Dfb". (Warm Summer Continental Climate).
The average temperature for the year in Bozeman is 41.0°F (5°C). The warmest month, on average, is July with an average temperature of 65.0°F (18.3°C). The coolest month on average is January, with an average temperature of 15.0°F (-9.4°C).
The highest recorded temperature in Bozeman is 100.0°F (37.8°C), which was recorded in July. The lowest recorded temperature in Bozeman is -46.0°F (-43.3°C), which was recorded in January.