This section is from the book "The Gardener V3", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
The opinion of a gardener of Mr Cramb's reputation and experience deserves attention. I quite agree with him concerning the danger of propagating from a barren stock; but in our case I do not think that was the cause of failure. Our first lot, which Mr Cramb saw, were certainly propagated from a doubtful stock; not so the next, however, for we were particularly careful to get our new stock from a fruitful plantation. These we planted in March, and they bloomed freely the same season; and we were personally careful to layer our pot plants from those that did bloom only, but with no better results, when the forcing season came round, as regards Keen's Seedling; the other varieties did well enough. After we had seen that our new plantation outdoors was disposed to fruit, we picked the blooms off. The plants grew well, and kept showing bloom for a good while, which was picked off as it appeared. Next year, however, and the next, they were an utter failure, though they were planted in deeply-trenched well-prepared ground, and mulched during the summer. Since then we have not had a Keen's Seedling on the place. I was at one time as much in love with this variety as Mr Cramb is, but our confidence received a rude shock at that time.
I think Mr Young's experience with Keen's is similar to our own. Black Prince and a few other kinds have, on the other hand, quite an opposite tendency, bearing in excess both indoors and out. In forcing, it has never failed with us, and we have at the present time some hundreds of feet of shelving filled with plants of it, in 4½ and 5 inch pots, laden with fruit.
 
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