Finding artistic value on Modern type

Trellises have been a favorite landscape architectural element throughout the ages. Some serve as partial walls, screening off less desirable views, others to enframe a view. All of which support flowering plant material, usually varieties of vines. Trellises are formed into many shapes and sizes, different configurations to serve various needs: Overhead trellises create a ‘landscape room’ beneath while an arched trellis may serve as a ‘gateway’ into the garden itself. The focus of this article is upon the architectural-building material from which the trellis is constructed; it is not of wood, metal tubing or from expensive wrought iron.

When I was touring northern Italy and Spain I was struck by the timeless beauty of wrought-ironworks, fashioned out of the architecture of the buildings and into the garden trellises. It was not so much the ornate details that I found so interesting as I found the strength and durability of the material to be: it tested time, only growing more attractive. Later, back in the U.S.A. and practicing my profession as a Landscape Architect I found that wrought-iron was not often affordable except in only the most selective of projects (i.e. those with very, fat budgets).
I did design my share of wooden and hollow-tube trellises over the years but I was always looking for a material that would capture the essence of wrought-iron and at an affordable price. That is when I began experimenting with REBAR (reinforced iron for concrete building footings).

Rebar comes in a variety of diameters and surface patterns, usually in 20 foot lengths. It is the ‘poor cousin’ of construction-metals exclusively finding its’ way into concrete pours to reinforce the structural value of footings, walls and flat surfaces. I have not seen it utilized for much else.

There are quite a few good reasons why rebar works well as a trellis building material. Personally, I like the way it looks, it reminds me of Sahuaro Ribs and Ocotillo sticks used in the Southwest. It also takes on the look of knotty pine poles as well. Part of its attraction is that the knobby surface catches the light in a play of shadows throughout the day (and also in the nightime with directed, accent lighting).

Rebar does not have to be treated or painted; it looks best in its natural state of surface rust. It can, however, stain tile or fabric beneath it. In a rainy climate it is a good idea to spray a mat-sealer over those areas that may drip. Most landscape surfaces, however, are durable enough to handle these occasional drips. On one occasion we had the rebar elements, powder-coated with bright colors to go with the festive character of the project (powder coating is baked-on paint, like on a automobile). I do not recommend this treatment because of its expense but it does have its uses.

Although rebar does not sculpt well as wrought iron will, it can be bent within certain limits. In fact, the bending of the rebar can be best taken care of at the rebar yard itself, (look under rebar suppliers in the yellow pages). They receive

specifications from building contractors for all sorts or shapes and configurations to accommodate their building footings etc. They usually raise an eyebrow to such requests eg. rebar stock bent for a trellis, but more often than not they get into the spirit of the project and appreciate the change of pace.

I once designed and built a rebar trellis that we named “Double-Helix”, a vine trellis; the curve linear shapes of the trellis’s roof-line created a shadow of a double helix on the ground. You also saw the double helix form when walking by the trellis. Naturally, you can build a rebar trellis out of straight pieces of rod as well and eliminate the bending. A really nice look is to use different diameter rebar sticks and place them alongside one another in a descending pattern. They can also be cut to different lengths and also be placed in a descending pattern. It is really up to your imagination or that of your designer and landscape contractor.

Some of the ’straight-rod’ rebar trellises that we have designed and built were topped with another interesting material i.e. sheets of reinforced, metal used to reinforce concrete driveways. These sheets generally come in 7 foot widths and vary in lengths, of about 10 feet. Their box pattern is usually in 4 inch squares; this allows for plenty of air flow and a chance for the vines to trail throughout the webbing.

Lastly, anchoring a rebar trellis to the ground is quite simple. Basically all you need to do is to dig a 2 foot or better deep hole, set the rebar leg into it and pour your concrete mixture around it. You can also integrate all or part of the trellis’s legs into a patio wall, if the overall architectural design of the house and garden will benefit from this application. Naturally, have your construction details reviewed by your licensed landscape contractor.