Higher yields have undoubtedly been obtained from other plantations and from other individual bushes and certainly lower yields, also, may be expected. Those given above are for 1946 from the best ten-year-old bushes in a plantation of forty plants.
Yield and size of nut while of major importance are not the only criteria for appraising the value of a nut variety. In filberts, such points as ease of husking, amount of fibre and, of course, quality must be considered. Also, as in other nuts, thickness of shell and proportions of kernel to shell are quite important. Vigour and hardiness of bush and hardiness of flower, male and female, are assumed, as without these high yields are not to be expected.
Most of the filbert varieties in bearing at the Horticultural Experiment Station with a few of their outstanding qualities are noted below.
Barcelona has a rather thick shell and too much fibre. It matures early, first week of September, and the nuts drop out of the husk fairly readily. The plant is strong and vigorous and somewhat spreading in habit of growth. It appears to be hardy.
Du Chilly is not always hardy and it is difficult to husk. Some bushes of this variety have given quite low yields.
Medium Long is a useful nut. It is not as large as the former two, but it fills well and there is very little fibre; also the shell is thin. It ripens somewhat later than Barcelona and is easy to husk.
Bixby is of medium size, somewhat pointed with a medium thick shell but almost no fibre. It is late in maturing, first week of October, and does not husk readily.
Daviana is a large, attractive nut with a moderately thin shell and has very little fibre. The quality is good. The nuts are mostly borne singly but with some pairs and they are apt to cling to the husk.
Cosford is a very nice nut. It is similar to Medium Long, somewhat smaller and of good appearance. It has a thin shell and is of good quality. It ripens early and separates readily from the husk. Perhaps not always hardy.
Bolwyller is hardy, yields moderately well and has nice quality.