No, the floor there is not wooden, only simple earth, but on this earth stand a greenhouse. We have a cold nights here. In the day can be +30 C, but in the night can be only + 10 C, or sometimes, in a cold summer, + 6 C. This is too cold for the watermelons, i think. We have a late spring and early autumn. For example, in the end of the May here can be a little frosts, or sometimes in the begin of the June.
I bought a little melons, special for this clima, it can be only 1-2 kg (2-4 lbs?), never heavier. I use a greenhouse, it is 12x3 meter (or feet), two long beds. Basically there are a cucumbers, but half of the beds are melons. If this year everything goes well, I will plant more melons (i must to see). I do not know, I will have time or not, but I'm going to build another greenhouse and had already prepared for this a metal poles and chose the place.
In Rusia grow a large melons, but not here, it's far from Moscow, somewhere further south, in Astrakhan, for example. 1390, no, 1450 km from my house ))) Too far for to buy there any plot ))
I'm looking at different varieties of water melons for next year ............even from Russia , a seed company in the USA has seeds from all over the world .Our temps don't get the cool at night here , but it's still a hit and a miss to even get water melons to grow here , next year I plan to have a garden with many varieties in it , red and yellow flesh, see how that will go .But consideing I planted seeds I think it id doing remarkably well