Whiteflies are tiny, 1mm long. They resemble moths with white powdery wings. As soon as the weather warms, they attack many vegetables and ornamental plants.
Control whiteflies by wiping plant leaves with cotton dipped in diluted rubbing alcohol or use a small hand held vacuum to scour whiteflies off leaves or even out of the air as they hover over plants.
To repel, try marigolds or nasturtiums.
Hang a yellow card covered with an adhesive over infested plants, whiteflies will get stuck, the larger the card the better. A yellow file folder is ideal. Whiteflies are killed quickly with this lemon spray. Boil 2 large peels or 4 small peels of lemons in 4 cups water. Cool, strain and place solution in a spray bottle.
Nicotiana and Catnip lure whiteflies away from other plants.
The world's tallest-growing tree is the coast redwood (Sequoia sempervirens), which grows along the Pacific Coast of the United States, mainly in California. Interestingly enough, it's not the world's oldest-growing tree; that award goes to a bristlecone pine (Pinus aristata).