There is one remarkable circumstance[1079] in connection with the seed of beet; it does not all germinate in the first year, but some of it in the second, and some in the third even; hence it is that a considerable quantity of seed produces only a very moderate crop. Some plants produce only in the year in which they are set, and some, again, for successive years, parsley, leeks, and scallions[1080] for instance; indeed, these plants, when once sown, retain their fertility, and produce for many years. CHAP. 36.—THE NATURE OF THE VARIOUS SEEDS. In most plants the seed is round, in some oblong; it is broad and foliaceous in some, orage for instance, while in others it is narrow and grooved, as in cummin. There are differences, also, in the colour of seeds, which is either black or white; while some seeds are woody and hard, in radishes, mustard, and rape, the seeds are enclosed in pods. In parsley, coriander, anise, fennel, and cummin, the seed has no covering at all, while in blite, beet, orage, and ocimum, it has an outer coat, and in the lettuce it is covered with a fine down. There is no seed more prolific than that of ocimum;[1081] it is generally recommended[1082] to sow it with the utterance of curses and imprecations, the result being that it grows all the better for it; the earth, too, is rammed down when it is sown, and prayers offered that the seed may never come up. The seeds which are enveloped in an outer coat, are dried with considerable difficulty, that of ocimum more particularly; hence it is that all these seeds are dried artificially, their fruitfulness being greatly promoted thereby. Plants in general come up better when the seed is sown in heaps than when it is scattered broad-cast: leeks, in fact, and parsley are generally grown by sowing the seed in little bags;[1083] in the case of parsley, too, a hole is made with the dibble, and a layer of manure inserted.