Goutweed is a pest in nearly all gardens, and very difficult to get out. When it runs into the root of some patch of hardy plant, if the plant can be spared, I find it best to send it at once to the burn-heap; or if it is too precious, there is nothing for it but to cut it all up and wash it out, to be sure that not the smallest particle of the enemy remains. Some weeds are deceiving--Sow-thistle, for instance, which has the look of promising firm hand-hold and easy extraction, but has a disappointing way of almost always breaking short off at the collar. But of all the garden weeds that are native plants I know none so persistent or so insidious as the Rampion Bell-flower (_Campanula Rapunculus_); it grows from the smallest thread of root, and it is almost impossible to see every little bit; for though the main roots are thick, and white, and fleshy, the fine side roots that run far abroad are very small, and of a reddish colour, and easily hidden in the brown earth.
But some of the worst garden-weeds are exotics run wild. The common Grape Hyacinth sometimes overruns a garden and cannot be got rid of. _Sambucus ebulis_ is a plant to beware of, its long thong-like roots spreading far and wide, and coming up again far away from the parent stock. For this reason it is valuable for planting in such places as newly-made pond-heads, helping to tie the bank together. _Polygonum Sieboldi_ must also be planted with caution. The winter Heliotrope (_Petasites fragrans_) is almost impossible to get out when once it has taken hold, growing in the same way as its near relative the native Coltsfoot.
But by far the most difficult plant to abolish or even keep in check that I know is _Ornithogalum nutans_. Beautiful as it is, and valuable as a cut flower, I will not have it in the garden. I think I may venture to say that in this soil, when once established, it cannot be eradicated. Each mature bulb makes a host of offsets, and the seed quickly ripens. When it is once in a garden it will suddenly appear in all sorts of different places. It is no use trying to dig it out. I have dug out the whole space of soil containing the patch, a barrow-load at a time, and sent it to the middle of the burn-heap, and put in fresh soil, and there it is again next year, nearly as thick as ever. I have dug up individual small patches with the greatest care, and got out every bulb and offset, and every bit of the whitish leaf stem, for I have such faith in its power of reproduction that I think every atom of this is capable of making a plant, only to find next year a thriving young tuft of the "grass" in the same place. And yet the bulb and underground stem are white, and the earth is brown, and I passed it all several times through my fingers, but all in vain. I confess that it beats me entirely.