 See also: Union, Plant, Bud, Soil, Growing
bud union (alt. budding union)
The junction on a stem, usually swollen, where a graft bud has joined the stock following the process of budding. Usually found at or near soil level.
GardenWeb Glossary of Botanical Terms
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bud union
The place on a grafted plant where the rootstock and the scion meet. Typically the bud union can be found near the base of the plant and should be just above ground level.
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Bud Union - The point where a plant has been grafted. Usually indicated by a small knoblike growth on a tree, shrub, or rosebush.
Cambium Layer - The green growth layer just next to the bark.
Bud union - The place at which the bud/shoot joins the root stalk.
Bulb - In general any structure underground from which a plant can grow. A true bulb is an underground structure that contains an embryonic plant protected by scales.
Bud union A swollen and distinct node when a bud has been grafted.
Bulb The thickened underground storage organ of the group of perennials which includes daffodils and tulips.
bud union The suture line where a bud or scion was grafted to a stock. Sometimes called the graft union.
budding The grafting of a bud onto stock of a different plant. The bud is the scion.
Bud Union
After grafting the buds on fruit trees, the nodes will appear swollen. This is the bud union.
The bud union will look like a dark knob, at or just below the soil line.
It's not uncommon for rose plants to be grafted onto hardier root stocks. This helps the rose survive in colder climates, but it can also lead to a problem with suckers.
Check the bud union and avoid plants with dead wood, damage, decay or signs of corky growth.
Your rose bud union should be a few inches above the soil if you live in warmer Zones with year round temperate climates. In colder zones, you will need to plant the bud union under grounds.
Bud union; graft unionA swollen area just above the soil level where one variety has been grafted onto the rootstock of another variety. The bud union is not always swollen, and on some older plants it can be difficult to find.
In Australia, the bud union or graft should be 4 cm to 5 cm above the surface of the soil.
Rose Disease ...
There will be a bump on the trunk called the bud union. You want the bump to be about two inches above the soil surface. This bump or bud union is where the scion, or top portion of the tree, was grafted onto the rootstock.
Plant the tree to the same depth of the stem's soil mark, or with the bud union above soil level. Soak thoroughly again after planting. When planting bare-rooted trees, prepare a squire hole large enough for its root system.
Warm winter areas should plant with the bud union (the swollen joint between the root stock and the scion or grafted cane) 1" above soil level, ...
When planting grafted roses in cold zones, be sure to set the bud union five to 10 centimetres below the surface of the soil. Be prepared to water weekly and more often during dry spells, wetting the soil to a depth of at least 45 centimetres.
Do not allow the wrapping to constrict the bud union. About 10 days after budding, check the buds and release the wrapping by making a single vertical cut on the backside of the stock, away from the bud.
The bud union needs to be protected from cold winds and major changes in freezing and thawing. This is done in rose gardening by mounding up the soil after the first frost to about one foot in height.
"It's growth that's coming from the bud union and it needs to be removed for the tree to maintain its health." The bud union is where the lemon was budded onto the rootstock to help it grow vigorously.
In zones 6-10, the bud union should be about an inch above the soil surface. In zones 5 and under, it's a good idea to bury the bud union an inch or so under the soil surface. Use a wood dowel or the handle of a shovel to gauge the proper depth.
When removing an entire cane, make the cut as flush as you can to the bud union. If you leave a stub, it can die back into the bud union allowing entry for disease and pests.
You may need to use a tree saw to get the final flush cut.
When you plant the tree, be sure the "bud union," where the scion meets the rootstock, is roughly 2 to 3 inches above ground level. Water and gently tamp the soil as you replace the dirt around the rootball; this will remove any air pockets.
Hybrid roses generally benefit from a simple process that protects the bud union (where the hardy rootstock is grafted to the flowering portion of the plant).
Plant them with the bud union (knob) an inch below the surface of the ground. The hole should be large enough to permit spreading out the roots without bunching them. Spread the roots in the hole and pack soil under, around, and over them.
Plant the tree so the bud union is approximately one inch above the soil. If a peach tree is planted too deep it may be injured or killed. Fill in the hole, tamp down the surrounding soil, and finish by moderately watering.
Fall-planted trees are more subject to cold injury during the first winter after planting. Plant the bud union 4 inches below ground level for good anchorage. The soil should be well settled and firm around the roots.
Training and Pruning ...
Winterize Your Rose Bushes. Place shredded leaves or compost around the base of the plant to protect the bud union. Tie longer canes together to prevent damage from the wind. Do not prune until spring.
roses -- they need good soil and regular watering and feeding. When planting outdoors in the ground, minis should be set slightly deeper than they were when growing in the pot. That's because they grow on their own roots with no bud unions.
Hardy in cold, they prefer full sun or partial sun in Zones 8 and 9. Plant grafted peonies 6 to 12 inches above the bud union. Choose seedlings in bloom to be sure what you are getting. Sold bareroot in winter or in containers year-round.
See also: Union, Plant, Bud, Soil, Growing
  
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