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.
budwood ...
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.
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.
The bud union, the swollen point on the main trunk of a grafted rose plant, marks the place where the desired rose variety has been joined to a hardy root system. The bud union is used to gauge depth of planting.
Check the bud union and avoid plants with dead wood, damage, decay or signs of corky growth.
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, ...
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.
I was reading about planting my roses and it mentioned that it is important to have the bud union placed at the right depth. I live in the midwest and it does get cold so does this mean I should plant the rose's bud union deeper in the soil?
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.
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.
 See also: Bud, Plant, Union, Soil, Water
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