Before the season gets too far advanced there is still time to take many types of hardwood or semi hardwood cuttings.
All you need to do this is a pair of secateurs or pruning knife, and a corner of the vegetable patch or one of your borders.
It will even work in a bucket of sandy soil or cold frame.
First, select a good sturdy stem that is a year old (two year old wood will work but can be a lot more stubborn to get going.
You need a piece of stock about 10-40cm with strong swelling buds and no visible damage, fungus or insect damage.
Then count out 8-12 buds and trim the weaker growth from the top with a sloping cut just above a bud.
You can now dip the thick end into rooting compound although with poplar it is not essential and I rarely use it.
I like to pour water into the hole at this point, very much like you would transplant a leek. This will allow the fine soil particles to wash against the stem without the potential of the buds breaking off.
Take a few cuttings to allow for failures and by the Autumn you can transplant to your required location.
It is free and very satisfying. I took 20 Poplar cuttings two springs ago and I have just transplanted the trees which now range from 1.8m to 4m high.