District Office Landscape Project

2026-11-03

A . Plant Materials 1 . Plant Schedule A complete schedule of plants , including quantities , sizes , and other requirements , as shown on the Landscape Drawings . Each plant shall have a durable legible label with plant size and name ( genus , species , variety , cultivar ) securely attached when delivered and in place until after acceptance . Labels shall not damage plants . 2 . Plant Quality Species and Culture All plants shall be true to species and variety specified and nursery grown in accordance with good horticultural practices . Plants shall be so trained in development and appearance as to be compact and symmetrical . They shall be sound , healthy , vigorous , well - branched , and densely foliated when in leaf . Plants shall be free of disease and insect adults , eggs , pupate , or larvae . They shall have healthy , well developed root systems and shall be free from physical damage or other conditions that would prevent thriving growth . All plant material shall be free of contamination by any plant not specified , including non - native invasive plants , seeds , and plant parts . B . Tree Trunk Specifications Tree trunks shall be straight and well - tapered . Trees with multiple leaders , unless specified , will be rejected . Damaged , cut , or crooked leaders ; included bark , bark abrasions , sunscald , disfiguring knots , mold , and prematurely opened buds , or cut limbs over three - quarter inch ( 3 / 4 ”) diameter that are not completely callused are cause for rejection . Trunk diameter and taper shall be sufficient so that tree remains vertical without support . C . Crown Configuration Specification Crown ratio ( distance from bottom of canopy to tree top / tree height ) should be at least sixty - six percent ( 66 %) of total tree height . One - half ( 1 / 2 ) or more of the foliage should be on branches originating on the lower two - thirds ( 2 / 3 ) of the trunk , and one - half ( 1 / 2 ) or less should originate on the upper one third ( 1 / 3 ). D . Branch Specifications All branches shall be less than two thirds ( 2 / 3 ) the diameter of the trunk measured one inch ( 1 ”) above the branch . The attachment of branches shall contain no bark inclusions . There shall be one dominant leader straight to the top of the tree . Larger branches shall be spaced at least six inches ( 6 ”) apart and arranged radially and vertically along the stem . There shall be live buds or foliage to the ends of all twigs . shall not be pruned immediately prior to delivery . Needled evergreens shall not have been sheared . E . Root Flare and Root Ball Specifications No root in the root ball larger than one - quarter inch ( 1 / 4 ”) diameter shall circle more than one - third around the root ball . There shall be no roots in the root ball that make an abrupt turn of ninety degrees ( 90 °) or more . There shall be no roots in the root ball that are ‘ J ’ roots , kinked , stem girdling , or potentially stem girdling . For all plants , including bare root , roots shall exhibit healthy , well - branched root systems characteristic of the species with adequate spread . Roots in ball - in - burlap root balls or in containers shall be well - rooted and uniform throughout soil mix or growth media . Roots of trees produced in containers shall have been held in the container for a period of one growing season and no longer . Roots shall not be pot bound . Major roots shall be less than two inches ( 2 ”) from the top of root flare . The root flare ( trunk flare , root collar ) shall be at the surface of the root ball ( container media ). Soil above the root flare shall not be included in ball depth measurement and should be removed . Nursery Stock rot balls shall be of sufficient depth to include fibrous and feeding roots . Balls shall be securely wrapped in burlap and tightly bound with rope or twine . Trees may be wire baskets lined with burlap and tightly bound with rope or twine . Balled - in - burlap plants with manufactured balls or container plants that are dry , cracked , or broken before the plant operation will be rejected .

Missouri

2026-04-29