Hello,
Last year I'd got a load of 18 m3 of ash brought over to split, only problem was that ash was poplar. It's dried out, split to roughly 8 cm cross sections it will dry out in half a year, stacked with decent air circulation under cover, but it is worthless for heating even though my neighbor loves his. It also can be far more work to split than, lets use ash again for example. In fact it is one of my least favorite wood to split with an axe, but not as bad as horse chestnut - nothing's as cranky as horse chestnut, also another one of those woods that will give out a flame but has so little energy to release. I'll take poplar, but not happily, because it is available and I have space, but I make every effort to avoid it except for certain building projects. There it can be very well worth the effort to acquire.
For planting and harvesting ones own fire wood the effort would be much better spent putting in ash, some maple species, sweet chestnut, alder's not bad, just those medium hard hardwoods that store up much more energy. Willow is a bit heavier than poplar, how do I know, because every year about this time I get two pair of wooden shoes from the shoe maker, one pair willow and one pair poplar to last me the coming year, but for stopping in the wood burner there will be no practical difference.
Greetings,
Don Wagstaff