It is desirable to cover with burlaps or bale with cornstalks, straw or some other coarse litter, all young trees which are being planted in untried places; and even where old trees are safe, young trees which go into the frost period with new growth of immature wood should be thus protected. Do not use too much stuff nor bundle too tightly. Not Orange on the Osage. Can the Navel orange be grafted on the osage orange? I understand it is done in Florida, and would like to know if it has been tried in California. It cannot. It has not been done in Florida nor anywhere else. The osage orange is not an orange at all. The tree is not a member of the citrus family. No Pollenizer for Navels. I read that the flowers of the Navel orange are entirely lacking in pollen, or only poorly supplied. If this is true, what variety of orange would you plant in a Navel grove - to supply pollen at the proper time? We would not plant any other orange near the Navel for the sake of supplying it with pollen. Pollen is only needed to make seeds, and by the same process to make the fruit set, and Navels do not make seeds, except rarely, nor do they seem to need pollen to make the fruit set. Water and Frost. From how many acres could I keep off a freeze of oranges with 1000 gallons per minute? The water is at 65 degrees. The amount of water will prevent frost over as large an area as you can cover with the water, so as to thoroughly wet the surface, but the presence of water will only be effective through about four degrees of temperature and only for a short time. If, then, the temperature should fall below 27 degrees and should remain at that point for an hour or two, it is doubtful if the water would save your fruit. Water is only of limited value in the prevention of frost, and of no value at all when the temperature falls too low. What to Do with Frosted Oranges. What is the best plan of treatment for frosted orange trees? The crop will be a total loss. It does not show any tendency to fall off the trees, however. Should it be picked off, thrown on the ground and plowed under? Should this be done right away or later? Unsound fruit should be removed as soon as its injury can be conveniently detected and worked into the soil by cultivation; never, however, being allowed to collect in masses, which is productive of decay and which may be injurious to roots. If trees are injured sufficiently to lose most of their leaves, the fruit should also be removed if it shows a disposition to hang on. This will be a contribution to the strength of the tree and its ability to clothe itself with new foliage. Pruning Frosted Citrus Trees. How shall I prune two-year-old orange orchard, also nursery stock buds that are badly injured by frost; how much to prune and at what time?