If only I had known that there are equal concentrate ....

We use the Giersch free to combat horsetail. For this purpose we had first the dilute compositions obtained in the spray bottle. After it had been used, I came across the concentrate, from which by diluting many approaches can win, making this by far cheaper.
The medication works well (in contrast to all other tested agents), is important most exactly the instructions must be observed (the shoots should be at least 10 cm long before the treatment).
On the web you can find lots of advice at the moment.