What time of year do pine cones fall from trees?
White pines open and drop their seeds late in their second summer, then the cone drops off the tree. Some jack pine cones open naturally, others may wait 10-20 years and only open when exposed to intense fire. White spruce cones open and fall their first winter.
Seedlings also wouldn't last long in winter rain or snow. After a pine cone falls from the tree, it can still open and close. The scales open when dry because their outer halves shrink more than their inner halves, and they pull away from the cone. When wet, the scales swell shut.
- Female pine cones are generally found in the upper branches of the tree crown, above the male cone. This reduces the possibility of self-fertilization by the wind-borne male gametes. The female pine cone, or megastrobilus, produces the ovule, or unfertilized seed.
- Made from the natural syrup of boiled soft, green, young cones, the tasty, aromatic jam is used as a folk remedy for weakened immune systems. Pine cone jam has been used for centuries to treat bronchitis, cough, asthma, respiratory diseases, TB, arthritis, and cancers. Some pine needles are edible too.
- Once you have enough viable seed, they should be dried and stored in an airtight container or planted immediately, depending on when they were harvested, as pine tree seeds are usually planted around the first of the year. Start the seeds indoors, placing them in individual pots with well-drained potting soil.
Pine cones open and close depending on the humidity to help seed dispersal. Inside the pine cone there are lots of feather light seeds. When the weather is dry the pine cone opens up and any wind will catch the seeds and allow them to be dispersed in the air far away from the original tree.
- The process involves sporogenous cells (sporocytes, also called spore mother cells) undergoing cell division to give rise to spores. In meiotic sporogenesis, a diploid spore mother cell within the sporangium undergoes meiosis, producing a tetrad of haploid spores.
- Crossing over (genetic recombination) is the process where homologous chromosomes pair up with each other and exchange different segments of genetic material to form recombinant chromosomes. It occurs between prophase 1 and metaphase 1 of meiosis.
- Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.
Preheat oven to 200 degrees. Line a cookie sheet with aluminum foil and spread pine cones across it in a single layer. Place the pine cones in the oven for 30 minutes or until the cones are fully opened and the sap has melted. Do not leave the oven unsupervised during this time, be alert for smoke or fire.
- Mix Christmas blend essential oil in a spray bottle with some water. If you prefer, you can also use cinnamon or clove oil. Spray the pine cones with the scented water and seal the cones in a plastic bag. Remove the pine cones after 24 hours.
- Despite common perception, Poinsettia plants are not poisonous. That's not to say your bunny should eat them, since they can cause mild intestinal discomfort in some sensitive individuals. But they should not cause serious illness. Some holiday plants, such as holly, mistletoe and certain types of ivy, can be toxic.
- Each pine cone makes two seeds per cone scale, and sometimes you can see the outline of where the pair once sat if you look at a cone carefully.
Updated: 28th October 2019