Friday, June 25, 2010

Growing Shade

Our new house is totally exposed to the elements on the east, south, and west sides. During the hot summer, this means it bakes in the sun. Figuring out how to provide shade is proving more difficult than usual because of the elevated heavily-compacted pad the house sits on - a pad that was engineered to keep this house from being washed off the property like two other mobile homes have been. In other words, it's not smart to mess with the pad if we want to keep our house. No trees can be planted in the pad because the roots would destabilize it.

Not only do we have a bit of elevation gain from the pad, the house itself sits up on house jacks, raising it another 12-24 inches. This is good from the standpoint of easy access to plumbing underneath the house but a real challenge when it comes to shading the exposed sides of the house all the way up to, and preferably over, the roof line. We can't plant close to the house plus it's the desert and trees do not grow to such tall heights quickly. Buying full grown trees are simply not an option on our budget.

What we can do, however, is nurture and encourage the drought-adapted desert trees that are already here. There are four mesquite trees situated at various points on the east, south, and west sides of the house, each about 20 feet or so from the house. Mesquites can grow pretty big with a canopy that spreads out and provides significant shade. We are working to encourage more rapid growth by providing wells for additional water (graywater from the house) and I will prune them to encourage more upright growth this fall.


This little guy has the furthest to grow. It's just over a foot tall so far. I've scraped a temporary well around it and have been pouring buckets of water on it. I did some minor pruning to remove low branches already.


This tree has potential but it was leaning way out from the fence. I pruned it heavily and then tied two of the major trunks up to the fence. It still needs a well formed around it. I'll probably use some of the rock around the property and mortar to keep it intact since it's close to our driveway.

With any luck, we'll start getting some shade out of these trees within the next five years or so. We plan to leave all of the mesquites growing on the property for shading. They are good for that and they have deep taproots to find water. The pruned branches can also be burned in the rocket stove and future cob oven.

Even so, I'm not sure the trees we have will provide enough shade to offset the temperature rises we're likely to experience here over our lifetime, but we'll do what we can! (Thanks go to Beany for linking to that presentation.)

5 comments:

knutty knitter said...

Shade is a problem here. We need every skerrick of sunshine we can muster and somebody about 80 years back planted a magnificent rhododendron too close to the kitchen! Its 20 feet high at least and not moveable because of bank/foundations/cost.

At present we live with the shade which fortunately only affects the one room but I do wish people who plant things would think about what they will be like when full grown!

viv in nz

katecontinued said...

I live in a trailer with an add-on and hope to build a green roof - using a carport sort of design. That is, building a structure over my home and extended beyond to grow drought tolerant plants in some planting matter (including clay balls that hold moisture). I've thought for the last decade that Arizona is a great place for green roofs to help protect homes from the worst of the sun's rays. It would extend the life of a roof besides insulating. If one builds correctly with site, wind patterns, etc. the roof could help direct air flow between home and structure for a passive solar design. Plus it is a home for critters out of the dogs' world.

I lack the right contractor or I'd be building one right now.

Sharlene T. said...

Could you not 'build' a high trellis of large-leafed vines on those sides?... that should give you alot of shade along the length of the side...make it a foot higher and have the tops of the 'trellis' angled out and over your place...pvc pipe and twine would do it (unless it's too windy, there)... and in the winter, it would be open for any solar heating... just wondering...


Twitter: SolarChief

Chile said...

Viv - too much shade in the wrong place can be just as bad as too little. We often see planting errors where folks don't consider the size of the mature plant. Actually, that worries me just a little with the trunk of that little mesquite so close to the fence corner...

kate - interesting idea. I think my main concern would be access to it for maintenance. Due to the elevated pad and house jacks, the roof is pretty high up. We've already determined that any solar panels we may get should be mounted on the ground as we may not feel safe getting up on the roof 10 years hence. We'd also have to look closely at whether the capital costs would be worth the savings over time. Thanks for the suggestion.

Sharlene - We are looking at the possibility of trellising vining plants in some places for shade. Options include kiwi, loofah, and grapes. Due to the pad, they'd need to be planted in some kind of container. Not likely to happen this year but possibly next.

daharja said...

Hi -When I was in Melbourne working on permablitzes, we were uses old wooden pallets, breaking them up then nailing them together to provide shading and pergolas.

Most companies will let you take away pallets free of charge - they're rubbish to them, and they're glad to see them gone.

In the permablitzes, we were creating the shelter for the young trees, then they would establish better. It worked well, and really helped encourage new growth in Melbourne's hot climate.

Just thought it might be something you want to try too :-)