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Koelreuteria bipinnata
( Bougainvillea Golden-Rain Tree )

Small to medium sized deciduous tree, 20 to 40 feet tall, 15 to 25 feet wide. Growth habit is upright and spreading, in youth the thick stems must be pruned to induce a mature dense crown. Yellow flowers are on large, upright panicles, one to two feet tall, 8 to 16 inches wide; a dramatic late summer flowering tree. Fruits are three-valved pink capsules, very ornamental in their own right, can be dried for arrangements. Adaptable to various conditions. Native to China.


How to Grow this Plant:


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Characteristics
Cultivar:n/a  
Family:Sapindaceae  
Size:Height: 0 ft. to 40 ft.
Width: 0 ft. to 30 ft.  
Plant Category:trees,  
Plant Characteristics:decorative berries or fruit, spreading,  
Foliage Characteristics:deciduous,  
Foliage Color:green,  
Flower Characteristics:long lasting,  
Flower Color:yellows,  
Tolerances:deer, drought, pollution, rabbits,  
Requirements
Bloomtime Range:Late Summer to Early Fall  
USDA Hardiness Zone:5 to 9  
AHS Heat Zone:Not defined for this plant  
Light Range:Sun to Full Sun  
pH Range:4.5 to 8.5  
Soil Range:Some Sand to Some Clay  
Water Range:Dry to Moist  

Plant Care



Fertilizing
How-to : Fertilization for Young Plants

Young plants need extra phosphorus to encourage good root development. Look for a fertilizer that has phosphorus, P, in it(the second number on the bag.) Apply recommended amount for plant per label directions in the soil at time of planting or at least during the first growing season.

Light
Conditions : Full Sun

Full Sun is defined as exposure to more than 6 hours of continuous, direct sun per day.

Watering
Conditions : Regular Moisture for Outdoor Plants

Water when normal rainfall does not provide the preferred 1 inch of moisture most plants prefer. Average water is needed during the growing season, but take care not to overwater. The first two years after a plant is installed, regular watering is important. The first year is critical. It is better to water once a week and water deeply, than to water frequently for a few minutes.

Planting
How-to : Planting a Tree

Dig out an area for the tree that is about 3 or 4 times the diameter of the container or rootball and the same depth as the container or rootball. Use a pitchfork or shovel to scarify the sides of the hole.

If container-grown, lay the tree on its side and remove the container. Loosen the roots around the edges without breaking up the root ball too much. Position tree in center of hole so that the best side faces forward. You are ready to begin filling in with soil.

If planting a balled and burlaped tree, position it in hole so that the best side faces forward. Untie or remove nails from burlap at top of ball and pull burlap back, so it does not stick out of hole when soil is replaced. Synthetic burlap should be removed as it will not decompose like natural burlap. Larger trees often come in wire baskets. Plant as you would a b&b plant, but cut as much of the wire away as possible without actually removing the basket. Chances are, you would do more damage to the rootball by removing the basket. Simply cut away wires to leave several large openings for roots.

Fill both holes with soil the same way. Never amend with less than half original soil. Recent studies show that if your soil is loose enough, you are better off adding little or no soil amendments.

Create a water ring around the outer edge of the hole. Not only will this conseve water, but will direct moisture to perimeter roots, encouraging outer growth. Once tree is established, water ring may be leveled. Studies show that mulched trees grow faster than those unmulched, so add a 3"" layer of pinestraw, compost, or pulverized bark over backfilled area. Remove any damaged limbs.

Problems
Miscellaneous
Glossary : Deciduous

Deciduous refers to those plants that lose their leaves or needles at the end of the growing season.

Glossary : Tree

Tree: a woody perennial with a crown of branches that begin atop a single stem or trunk. The exception to this rule is multi-trunk trees, which some may argue are really very large shrubs.

Glossary : Drought Tolerant

Very few plants, except for those naturally found in desert situations, can tolerate arid soils, but there are plants that seem to be more drought tolerant than others. Plants that are drought tolerant still require moisture, so don't think that they can go for extended period without any water. Drought tolerant plants are often deep rooted, have waxy or thick leaves that conserve water, or leaf structures that close to minimize transpiration. All plants in droughty situations benefit from an occasional deep watering and a 2-3 inch thick layer of mulch. Drought tolerant plants are the backbone of xeriphytic landscaping.

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