I have tried unsucessfully so many times to grow an avacado from seed. They NEVER last. Any suggestions?

The way I have tried is by putting toothpicks in it and suspending it in water until it sprouts. Then I have planted them when the roots come out. They allways start out well, but within a short time the leaves allways turn black and the plant dies a slow undignified death. I really would like to be successfull with one as I think they are beautifull. I don't think I could put it outside because I live in British Coulmbia, Canada, and I think the winters are too cold. Is the reason because I get them from the supermarket and not a nursery? Thanks if you can help.

Answers:
I think they grow only in tropical weather. I never heard of any local avacado.

Other answers:
avacados grow on trees, not small plants. You need to put a lot of time and effort to get the tree to grow, and then you will have avacados. This will take many years.
avacados grow on trees, not small plants. You need to put a lot of time and effort to get the tree to grow, and then you will have avacados. This will take many years.
You are definitely out of the climatic zone for Avocado plants, even in a less freeze-prone part of Canada. They are indeed tropical plants (origin thought to be southern Mexico) but will grow in warm-temperate areas if there are no frosts.
Avocados grow best in warm hummed climates.
1. Forget the toothpicks, put the seed in a good potting soil, about 2 inch. deep.
2. Keep soil moist, and the pot in the sunlight at all times.
3. Once it comes up, keep it misted with water.
4. A good plant food also helps them grow. never put plant food on a plant during the month of April.
5. Once it gets to 2 feet tall, transplant it. This will make it reproduce, If you have more than one. It takes two to tango. You can also use a plant growing light. The plant must be keep at 70 plus degrees temperature.
It sounds like you are doing all the right things as far as getting it to sprout, but once it has sprouted you must almost immediately move it into soil. "When the root system in the jar of water is about the size of a fist it is time to transplant it. Plant the young tree into at least a one gallon pot with fresh potting mix. Spread the roots out in the container but position the seed at the surface of the soil. Firm the soil down around the roots and water it in well."
As far as the hardiness zones go, check this link,
http://www.walterreeves.com/qa_display.phtml?qaID=105, but I'm unsure if you WERE to keep it pinched back and small if it would ever bear fruit. Another link that says it probably WON'T bear (because most avocados are grafted) is: http://www.avocado.org/about/2000_24.php?sd=about. I include this link not to discourage you, but because it has a great picture and clear directions on how to sprout seed.

You are in BC, and according to this map: http://nlwis-snite1.agr.gc.ca/plant00/index.phtml#, there are hardiness zones from 0a (BRRRRRRR) to 8a.we are in Texas, in zone 8b. So that is quite a range. If you lived right on the coast of BC, you might could grow that avocado out of doors.

Why not try these links for more options:
http://canada-gardens.com/1shopping.html#Outdoor%20Gardening,
http://www.nafex.org/supply_source.htm#canada;
Apples, Grapes, Apples, Pears, Plums, Apples, Peaches, and oh, did I mention Apples grow well in the northern climes?
lol

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