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BARK: Additives Recommended
To each cubic yard add 4 lbs. Urea (U.F.38), 2 lbs. triple superphosphate, 10 lbs, dolomite and 1 lb. iron sulphate. AU87Winter-17
About 10% coarse peatmoss mixed with it seems to start plants off faster than without. A81-1311
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BARK: Advantages and Questions
It's a variable product and does not produce as good growth as osmunda did, but it's accepted because it is easy to use although it can cause more trouble than most other media; what is lost by using it? OR81-391
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BARK: Best for Cymbidiums?
At end of third year of trials, plants in bark were significantly larger than in pumice or calcined clay. OA84-78
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BARK, COARSE: Watering Frequency for Potted Plants
More frequent watering is required to prevent shrivelling; better to water twice the same morning. A70-148
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BARK, COMPOSTED: For Cymbidium Mix
I.C.I, composted forest bark (50% with medium fir bark) is made from bark skinned from logs at pulp mills and composted. Orchid advocate, vol.5, no.5, 1979, p.166.
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BARK, FINE: Finer Than Seedling Bark
So fine it is sometimes called "coffee grounds" because of its appearance; should not be confused with fine seedling bark which is more commonly used. A71-310
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BARK: How to Prolong Its Life
Use 1.5 ttpg. Captan 50%WP (Orthocide) as drench once or twice yearly. A75-803; A76-795
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BARK: Pine
Garden mulch type; if pieces are not less than 1/4" in size, it is suitable as a potting medium but will not last as long as fir bark and should be washed and cleaned first of fines and dirt, A80-850
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BARK: Pine or Fir
Fir bark as used in the U.S. does not require "composting" to condition it before using; pine bark as used in Australia may benefit the plants by first being "composted", especially local barks; they are worth experimenting with; pine bark tends to decompose quickly OR85-69
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BARK: Potting Material
A history of its use from its beginnings, with names of its originators, their trials with different types and the results; refer to A87-1038
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BARK: Potting Mix
A typical mixture would have about 15 parts medium bark, 1-1/2 parts coarse Perlite, 174 part charcoal chips (quarter-inch size). OR87-173For cymbidiums in a high humidity area near the ocean in California the use of very large decorative bark pieces has been successful. OA82-8
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BARK: Recycled
If roots die back on approaching the media in the pot, empty the mix and sift out the fines, soak the remaining bark for four days and re-use. AU87Spring-10
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BARK, RE-USE: In Potting Mix
Uncertainty rules; use trial method; put some plants in previously used bark and some in fresh and compare results. A61-582
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BARK: Sequoia Type
It's a mixture of several barks, fir, pine and spruce. OR85-255
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BARKS: From Hardwood Trees
No trial has been successful with them; they decompose rapidly; develop heat and injure roots; high nitrogen favors decomposition; if available, chestnut bark is resistant. A74-896
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BARK, SOUTHERN PINE: Suitability for Potting
Has been used but results were not very satisfactory as a rooting medium; use it only weathered and composted. A75-437
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BARKS, SUITABLE: Other Than Douglas Fir
Silver birch, the rough part from the base of the tree; it is heavily crevassed with many a lay er of dead cells to decompose; also chestnut, pear and apple. N79-163
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BARKS, SUITABLE: Other Than Fir or Cork
In Australia weathered hardwood is recommended; short lengths of wood with bark adhering of ti-tree, malaleuca, or banksia are as good or better. AU79-199
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BARKS, SUITABLE: Other Than Fir or Redwood
Proven examples are few; more experimentation is needed; live oak should be good but hardwood barks decay rapidly; why not try others? A79-785
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BARKS: Toxins
They exist in fresh (Australian pine) bark but are absent in aged; ageing is achieved by storing it moist for six to eight weeks; tannin can be leached by soaking. AU76-75; AU79-51
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BARK: To Moisten or Not Before Using
Most authorities advise soaking before using; west coast growers sometimes pot in dry bark and water after one or two days to let broken roots heal; it seems to make no difference. OD67-117
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