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A plant border system includes a flat and a plant tray. The flat defines a flat cavity and a flat top opening communicating with the flat cavity. An upstanding rim surrounds at least a portion of the flat top opening. The plant tray defines a tray cavity and a tray top opening communicating with the

A plant border system includes a flat and a plant tray. The flat defines a flat cavity and a flat top opening communicating with the flat cavity. An upstanding rim surrounds at least a portion of the flat top opening. The plant tray defines a tray cavity and a tray top opening communicating with the tray cavity. The tray cavity has a tray width and a tray length that is greater than the tray width. The plant tray includes a collar surrounding at least a portion of the tray top opening, the collar defining a downwardly opening channel. The flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure.

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1. A plant tray system comprising:a) a flat defining a flat cavity and a flat top opening communicating with the flat cavity, the flat including an upstanding rim surrounding at least a portion of the flat top opening; and b) a plant fray defining a tray cavity and a tray top opening communicating w

1. A plant tray system comprising:a) a flat defining a flat cavity and a flat top opening communicating with the flat cavity, the flat including an upstanding rim surrounding at least a portion of the flat top opening; and b) a plant fray defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion of the tray top opening, the collar defining a downwardly opening channel; c) wherein the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; d) wherein the rim includes a plurality of spaced apart, upstanding projections adapted to engage the channel of the plant tray. 2. The plant tray system of claim 1 wherein the flat and the plant tray are each formed of a respective flexible, polymeric material.3. The plant tray system of claim 2 wherein the respective polymeric materials are each selected from the group consisting of high impact polystyrene, ABS, PVC and polypropylene.4. The plant tray system of claim 2 wherein the flat and the plant tray are each formed substantially of walls having a thickness of less than 0.07 mm.5. The plant tray system of claim 1 wherein the flat includes a lengthwise extending separator wall forming at least first and second lengthwise extending troughs in the flat cavity, wherein the first trough is adapted to receive the plant tray in close proximity such that the flat is thereby structurally reinforced by the plant tray to resist flexure.6. The plant tray system of claim 5 including a second plant tray and wherein the second trough is adapted to receive both of the first and second plant trays in side by side relation such that the flat is thereby structurally reinforced by the first and second plant trays to resist flexure.7. The plant tray system of claim 6 wherein the second trough is further adapted to receive the first plant tray alone such that the flat is thereby structurally reinforced by the first plant tray to resist flexure.8. The plant tray system of claim 6 wherein:the second plant tray has a second collar defining a downwardly opening second channel; and the flat is adapted such that the rim is received in the second channel when the second plant tray is disposed in the second trough and the flat is thereby structurally reinforced by the second plant tray to resist flexure. 9. The plant tray system of claim 6 wherein the flat includes a lengthwise extending second separator wall defining the second trough and a lengthwise extending third trough in the flat cavity, wherein the third trough is adapted to receive one of the first and second plant trays in close proximity such that the flat is thereby structurally reinforced by the received plant tray to resist flexure.10. The plant tray system of claim 9 wherein:the third plant tray has a third collar defining a downwardly opening third channel; and the flat is adapted such that the rim is received in the third channel when the third plant tray is disposed in the third trough and the flat is thereby structurally reinforced by the third plant tray to resist flexure. 11. The plant tray system of claim 1 wherein the rim has a generally inverted U-shaped cross-section and is adapted to reinforce the flat.12. The plant tray system of claim 1 wherein the flat includes a bottom wall and at least one laterally extending raised wall adapted to separate the plant tray from the bottom wall when the plant tray is disposed in the flat cavity.13. The plant tray system of claim 1 comprising a plant border including a growing medium disposed in the tray cavity and a strip of plants disposed in the growing medium in the tray cavity.14. The plant tray system of claim 1 wherein the tray length is at least six times the tray width.15. The plant tray system of claim 1 wherein:the flat cavity has a length extending from a first end of the flat to an opposed second end of the flat; and the length of the tray cavity is substantially coextensive with the length of the flat cavity. 16. The plant tray system of claim 15 including a second plant tray and wherein:a) the second plant tray defines a second tray cavity and a second tray top opening communicating with the second tray cavity, the second tray cavity having a second tray width and a second tray length that is greater than the second tray width, the second plant tray including a second collar surrounding at least a portion of the second tray top opening, the second collar defining a downwardly opening second channel; b) wherein the flat is adapted to receive the second plant tray in the flat cavity such that the rim is received in the second channel and the flat is thereby structurally reinforced by the second plant tray to resist flexure; c) the second length of the second tray cavity is substantially coextensive with the length of the flat cavity; and d) the first and second trays are disposed in side-by-side, substantially parallel arrangement. 17. A plant tray system comprising:a) a flat defining a flat cavity and a flat top opening communicating with the flat cavity, the flat including an upstanding rim surrounding at least a portion of the flat top opening; b) a plant tray defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion of the tray top opening, the collar defining a downwardly opening channel; and c) wherein the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; and d) wherein the plant tray system further includes a second plant tray having a second collar defining a downwardly opening second channel; and e) wherein the rim includes a plurality of spaced apart, upstanding projections adapted to engage the first and second channels to positively locate each of the first and second plant trays in the flat cavity. 18. A plant tray system comprising:a) a flat defining a flat cavity and a flat top opening communicating with the flat cavity, the flat including an upstanding rim surrounding at least a portion of the flat top opening; and b) a plant tray defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion of the tray top opening, the collar defining a downwardly opening channel; c) wherein the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; and d) wherein: the collar of the plant tray includes a collar recess extending downwardly into the channel; and the rim of the flat includes an upwardly facing rim recess adapted to receive the collar recess to allow to the collar to seat on a remaining portion of the rim. 19. The plant tray system of claim 18 wherein the plant tray has an end portion and the collar recess is adapted to facilitate removal of the end portion to form an end opening through which a plant border can be removed from the cavity of the plant tray.20. A flat for carrying and supporting plant tray of the type defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion the tray top opening, the collar defining a downwardly opening channel, wherein:a) the flat defines a flat cavity and a flat top opening communicating with the flat cavity; b) the flat includes an upstanding rim surrounding at least a portion the flat top opening; c) the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; and d) the rim includes a plurality of spaced apart, upstanding projections adapted to engage the channel of the plant tray. 21. The flat of claim 20 wherein the flat is formed of a flexible, polymeric material.22. The flat of claim 21 wherein the polymeric material is selected from the group consisting of high impact polystyrene, ABS, PVC and polypropylene.23. The flat of claim 20 wherein the flat is formed substantially of walls having a thickness of less than 0.07 mm.24. The flat of claim 23 wherein the flat is formed substantially of walls having a thickness of between about 0.02 and 0.07 mm.25. The flat of claim 20 including a lengthwise extending separator wall forming at least first and second lengthwise extending troughs in the flat cavity, wherein the first trough is adapted to receive the plant tray in close proximity such that the flat is thereby structurally reinforced by the plant tray to resist flexure.26. The flat of claim 25 wherein the second trough is adapted to receive first and second plant trays in side by side relation such that the flat is thereby structurally reinforced by the first and second plant trays to resist flexure.27. The flat of claim 26 wherein the second trough is further adapted to receive the first plant tray alone such that the flat is thereby structurally reinforced by the first plant tray to resist flexure.28. The flat of claim 26 wherein the flat includes a lengthwise extending second separator wall defining the second trough and a lengthwise extending third trough in the flat cavity, wherein the third trough is adapted to receive one of the first and second plant trays in close proximity such that the flat is thereby structurally reinforced by the first and second plant trays to resist flexure.29. The flat of claim 20 wherein the rim has a generally inverted U-shaped cross-section and is adapted to reinforce the flat.30. The flat of claim 20 including a bottom wall and at least one laterally extending raised wall adapted to separate the plant tray from the bottom wall when the plant tray is disposed in the flat cavity.31. A flat for carrying and supporting a plant tray of the type defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion the tray top opening, the collar defining a downwardly opening channel, wherein:a) the flat defines a flat cavity and a flat top opening communicating with the flat cavity; b) the flat includes an upstanding rim surrounding at least a portion the flat top opening; c) the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; and d) the rim includes a plurality of spaced apart, upstanding projections adapted to engage the respective channels of a plurality of plant trays to positively locate each of the plant trays in the flat cavity. 32. A flat for carrying and supporting a plant tray of the type defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion the tray top opening, the collar defining a downwardly opening channel, wherein:a) the flat defines a flat cavity and a flat top opening communicating with the flat cavity; b) the flat includes an upstanding rim surrounding at least a portion the flat top opening; c) the flat is adapted to receive the plant tray in the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; and d) the rim of the flat includes an upwardly facing rim recess adapted to receive a collar recess of the plant tray to allow to the collar to seat on a remaining portion of the rim. 33. A method for using a plant tray system, comprising the steps of:a) providing a flat defining a flat cavity and a flat top opening communicating with the flat cavity, the flat including an upstanding rim surrounding at least a portion the flat top opening; b) providing a plant tray defining a tray cavity and a tray top opening communicating with the tray cavity, the tray cavity having a tray width and a tray length that is greater than the tray width, the plant tray including a collar surrounding at least a portion the tray top opening, the collar defining a downwardly opening channel; and c) placing the plant tray into the flat cavity such that the rim is received in the channel and the flat is thereby structurally reinforced by the plant tray to resist flexure; d) wherein said step of placing the plant tray includes placing the plant tray on in the flat cavity such that a collar recess formed in the collar and extending downwardly into the channel is received in an upwardly facing rim recess formed in the rim such that the collar seats on a remaining portion of the rim. 34. The method of claim 33 wherein the flat and the plant tray are each formed of a respective flexible, polymeric material.35. The method of claim 33 wherein:the flat includes a lengthwise extending separator wall forming at least first and second lengthwise extending troughs in the flat cavity; and said step of placing the plant tray includes placing the plant tray into the first trough such that the flat is thereby structurally reinforced by the plant tray to resist flexure. 36. The method of claim 35 wherein the flat includes first and second lengthwise extending separator walls forming first, second and third lengthwise extending troughs in the flat cavity, the second trough being defined between the first and second separator walls and the first and third troughs being defined on opposed sides of the first and second separator walls.37. The method of claim 36 including the step of placing the plant tray in the first trough that the flat is thereby structurally reinforced by the plant tray to resist flexure.38. The method of claim 36 including the steps of placing a first plant tray in the second trough and placing a second plant tray in the second trough immediately adjacent the first plant tray such that the first and second plant trays cooperatively reinforce the flat to resist flexure.39. The method of claim 38 further including the step of placing a third plant tray in the first trough such that the flat is thereby structurally reinforced by the third plant tray to resist flexure.40. The method of claim 39 further including the step of placing a fourth plant tray in the third trough such that the flat is thereby structurally reinforced by the fourth plant tray to resist flexure.41. The method of claim 33 including placing a growing medium in the tray cavity.42. The method of claim 41 including growing a plurality of plants in the growing medium while the growing medium is in the tray cavity.43. The method of claim 33 wherein:the flat cavity has a length extending from a first end of the flat to an opposed second end of the flat; and the step of placing the plant tray into the flat cavity includes placing the plant tray into the flat cavity such that the length of the tray cavity is substantially coextensive with the length of the flat cavity. 44. The method of claim 43 including:a) providing a second plant tray defining a second tray cavity and a second tray top opening communicating with the second tray cavity, the second tray cavity having a second tray width and a second tray length that is greater than the second tray width, the second plant tray including a second collar surrounding at least a portion of the second tray top opening, the second collar defining a downwardly opening second channel; and b) placing the second plant into the flat cavity such that: the rim is received in the second channel and the flat is thereby structurally reinforced by the second plant tray to resist flexure; the second length of the second tray cavity is substantially coextensive with the length of the flat cavity; and the first and second trays are disposed in side-by-side, substantially parallel arrangement.