Flexible layered sheet

1. A flexible layered fabric sheet comprising a porous front layer and a pre-seeded substrate layer for supporting root growth, the two layers together having an upper edge and a lower edge and being attached together with a plurality of non-continuous seams between the upper and lower edges, wherein the seams have a component of direction parallel to the upper and/or lower edge, wherein the non-continuous seams enable water to exit the layered fabric sheet at the lower edge, wherein the non-continuous seams further serve to slow water flow through the sheet in a direction from the upper edge to the lower edge, wherein the non-continuous seams are stitched seams, and wherein the flexible layered fabric sheet includes a region for receiving an irrigation pipe, and wherein the region for receiving the irrigation pipe is formed by a gap between two seams of the plurality of the non-continuous seams.

2. The flexible layered fabric sheet as claimed in claim 1 , comprising an additional non-porous backing layer which is provided on a face of the substrate layer which is distal from the porous front layer.

3. The flexible layered fabric sheet as claimed in claim 1 , wherein a layer of seed paper forms part of the substrate layer.

4. The flexible layered fabric as claimed in claim 3 , wherein the seed paper layer of the substrate layer (i) rests on the remainder of the substrate layer and (ii) is situated between the remainder of the substrate layer and the porous front layer.

5. The flexible layered fabric sheet as claimed in claim 1 , wherein the seams are spaced at intervals between the upper and lower edges.

6. The flexible layered fabric sheet as claimed in claim 1 , wherein at least some of the seams intersect to form polygonal shapes.

7. The flexible fabric layered sheet system as claimed in claim 1 , wherein the sheet has a non-porous backing layer and wherein the non-porous backing layer forms a lip portion extending above the upper edge of the porous front layer and the substrate layer and/or below the lower edge of the porous front layer and the substrate layer.

8. A vegetative wall, comprising one or more flexible layered fabric sheets as claimed claim 1 mounted upon a structure or a support such that the upper edge of the or each sheet lies vertically higher than the lower edge and an irrigation supply is arranged at or towards a top of the sheet or of at least an uppermost one of the sheets, such that irrigation water flows downwards through the sheet or sheets, slowed by the non-continuous seams, to thereby enable the seed with which the sheet or sheets is or are pre-seeded to germinate and grow into vegetation.

9. The vegetative wall as claimed in claim 8 , wherein the one or more flexible layered fabric sheets comprise two or more flexible layered fabric sheets which are arranged one above the other such that irrigation water from the uppermost one of the sheets passes into at least one lower sheet.

10. The vegetative wall as claimed in claim 9 , wherein at least one of the sheets has a non-porous backing layer forming a lip portion extending beyond a top and/or a bottom of the porous front layer and the substrate layer and another one of the sheets overlaps this lip portion.

11. The vegetative wall as claimed in claim 9 , where the two or more flexible layered fabric sheets comprise two flexible layered fabric sheets, one higher than the other, such that the sheets are overlapped in a vertical direction.

12. The vegetative wall as claimed in claim 8 , wherein the structure to which the flexible sheet or sheets are affixed is a structure of scaffolding poles.

13. A method of forming a vegetative wall, comprising mounting at least one flexible sheet as claimed in claim 1 upon a structure or a support such that the or each sheet lies in a disposition such that the upper edge is vertically higher than the lower edge, providing an irrigation supply to supply irrigation water at or towards a top of the sheet or a top of at least an uppermost one of the sheets and allowing water to permeate through the sheet or sheets to thereby cause the seeds which the or each sheet has been pre-seeded with to germinate, and vegetation to grow.

14. The method as claimed in claim 13 , wherein the at least one flexible sheet comprises at least two flexible sheets which are mounted to the structure or the support such that at least one of the sheets lies vertically higher than at least one other sheet, such that irrigation water supplied to the uppermost one of the sheets flows downwards between that sheet and at least one lower sheet to irrigate the at least one lower sheet.

15. The method as claimed in claim 14 , wherein an irrigation flow in the at least one lower sheet is lower than that of the uppermost one of the sheets.

16. The method as claimed in claim 13 , wherein the at least one flexible sheet comprises two or more flexible sheets, at least one of the sheets having a non-porous backing layer extending beyond a top or a bottom of the porous front layer and the substrate layer to form a lip portion, wherein one of the sheets is mounted generally higher than another of the sheets and one of these sheets overlaps the lip portion of the other sheet.

17. The method as claimed in claim 13 , wherein the at least one flexible sheet comprises two flexible sheets, wherein the two flexible sheets are situated one above the other, and one of the flexible sheets overlaps the other in a vertical direction.