For questions about trees: selection, planting, care, diagnosis, pruning, etc.

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What are the limits to growing plants hydroponically?

I'm working with a group of artists, educators and engineers to develop new methods for STEM teaching in classrooms and museums. Right now, we are trying to design a room-sized model of the carbon ...
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Mexican Avocado tree grown indoors 1½ years old has round spots on leaves

I have a Mexican Avocado tree growing indoors in the winter (we live in the Northeast) outdoors in the summer. It has developed white round spots and the edges to the inside are becoming brown and the ...
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What is this leaf miner / tenter in my small bush/tree?

I have a small bush/tree. I don't know exactly what it is. What I see is the new growths folded over onto each other, and connected together. When I pull them apart, I can find tiny white worms with ...
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Can these two trees be identified by photo.

I would like know what these tree are. They are located in San Diego county California. The trees may not be native. Thanks, Jon.
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What's the most hardy red flesh apple for the Pacific Northwest?

I had two wonderful red flesh apples in Birch Bay, Washington. We've moved to St. Helens, Oregon and I can't find any here. I'd love to replace them. Does anyone know where I might find these and ...
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Transfering a swamp oak from pot to ground

I have an interesting project going. I was visiting the 911 Memorial site in NYC last fall. There are MANY swamp oaks planted on the grounds and in the footprint of where the twin towers stood. The ...