Category: Trees (Page 13 of 17)

Seed of the Week: Date Palm

We didn’t get any guesses last week for the mystery seed. I was hoping that someone would bite into a sweet, dried fruit, pull out the seed and say, “Aha! The mystery seed was a date seed!”

date-palm1

There are a lot of palm trees growing in the Phoenix metropolitan area of Arizona. One of my favorites is the date palm.

date-palm2

They have a lovely shape.

date-palm3

Although Phoenix dactylifera is the scientific name, date palms are probably originally from northern Africa.

Fruit_of_the_date_palm_tree

Date Tree photo self-taken for Wikipedia by Balaram Mahalder

There are a number of different cultivars of date palms. The fruit vary somewhat in shape, size, and of course, flavor.

The book, A Seed is Sleepy, by Dianna Hutts Aston and Sylvia Long, tells about a scientist finding a seed of an extinct date palm that was thousands of years old. When the scientist planted the seed, it grew!

See if you can find a date seed and plant it (just make sure it hasn’t been cooked). Let me know if you grow one.

Seed of the Week: Pine Seed

The mystery seeds from last week were from a pine, believe it or not.

pine-seeds

We did a common experiment to see whether open, dry pine cones do indeed close up when placed in water. The seeds floated out of the first cone when we first placed it into the water.

pinecone-wet

And then the pine cone did close up, remarkably quickly.

We looked at another open pine cone.

pine-cone-seed

You can just see tips of the seed wings on the hard pine cone scales. Those wings help them disperse in the wind, like the maple keys they resemble.

pine-cone

Here are pine cones on the ground. What kind of weather have we been having? (Hint: see above.)

pine-branch

Pine cones are often seen hanging on the tree. It takes at least nine months for the seeds to mature within the female cones. Some species require up to two years for the seeds to mature.

Even once the seeds are mature, certain types of pine cones remain closed until they are exposed to the intense heat of a fire.

The seed itself is within the winged structure. If you were to remove the coating, it would look like a pine nut:

pine-nuts

Although the tree associated with the Sonoran desert is usually the saguaro cactus, there are a few pine trees that are planted in urban areas. Two pines that can grow in hot dry conditions are the Mondel or Afghan pine, Pinus eldarica, and the Aleppo pine, Pinus halepensis. They are not native North America, but to regions around the Mediterranean.

What kind of pine trees grow where you live? Have you ever seen a pine seed?

Related activities:

Fibonacci numbers in pine cones

Have you ever tried a pine nut? Look for some in you grocery store and give them a try.

Seed of the Week: Silver maple

(I apologize to anyone who gets this as a duplicate via RSS feed. The original post was lost during a recent crash of the server.)

The mystery seed 8 last week was indeed a maple key, a silver or swamp maple (Acer saccharinum) seed to be exact.

silver-maple

Silver maples are commonly grown as ornamental trees in the eastern United States and southeastern Canada. They have lovely, delicate leaves with deeply cut lobes.

silver-maple2

It is easy to find silver maple keys because they are the largest winged seeds of the native maples and because the trees produce a lot of them. Many birds and small mammals use the seeds for food.

Hopefully a few of those seeds becomes a new tree.

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