You have two totally different types of seeds because one is a palm and one is a cycad. If I had to guess, I'd say it is too late for both types. I can't tell the difference in palm seeds on viability, but I can tell about cycads. Since the seeds have not been kept moist or protected in any way, I'd just give them the float test. Throw them in a bucket of water and see if any float, which most likely, all or most all of them will. You have a chance with any that sink. If you have a lot of the sago seeds, you can cut one in half, along the natural seems of the seed and look to see how bad off they are. If you have lots of them, cutting a couple gives you a real good idea of what you are dealing with.

My sago My Washingtonia Robusta

" I once had one survivea cold winter in Siuth Jersey in which it reached -6f! ,,,The mulched Sago flushed a new set of leaves to replace the leaves it lost in the bitterly cold winter." What was it mulched with, 3 rolls of corning fiberglass lain in a criss-cross pattern, forming a 6' high, 15' diameter mound? Yes enough mulch can protect almost anything, within reason, but it eventually becomes a not practical thing to do. At least with a plant like that. Probably more impressive: I had a small Cycas panzhihuaensis recover from 3F with very little mulching. Alas, I gave up on getting them to survive around here because it's a little wetter in winter here than western suburban DC and they just need to be drier than I can give them, apparently. Furthermore that might be a plant that doesn't get much hardier with age, or even gets less hardy with age...for various reasons too complicated to go into. Definitely more impressive: the last C. panzhihuaensis I had came back up from the ground after a full two years of "playing dead". Apparently it has some ability for the growth point to go into a long term senescence or dormancy. Maybe an adaptation to things like volcanic eruptions which caused brief mini ice-ages? They have been on this earth for a while. Alas, not surprisingly polar winter #1 finished it off for good. In retrospect I probably should have dug it up and coddled it for a few more years, but I was tired of dealing with them by then. (yes I know that post was from 2006, so it was a rhetorical reply) BTW you see large ones along the Gulf, and inland to some degree like Baton Rouge, so they can survive down to 15F as long as it's infrequent. Probably a zn 9 plant but cultivated in some sheltered, warmer parts of 8. I'm pretty sure that mature outdoor ones do _not_ defoliate with a brief dip to 25F.

I have grown as many as 200 cycad species over the last 29 years. It would take me hours to write everything I can tell you on this subject. My cycad cultivation articles have been printed in 17 different journals all over the world, and for almost a decade of years, I have been the president of The Cycad Society which is international in scope. All parts of the cycad is poisonous, even the pollen, and the jelly that was mentioned that the cones can excrete sometimes. People eat cycad material all over the world. Anybody know why Cycas revoluta is called the " sago palm"? Sago, or sagu, is a starchy porridge type food that the old native people from Japan made from the stem material. Seeds of Dioons are used to make tamales, and tortillas in Mexico and Honduras. The Aborigines in Australia have eaten the seeds of Lepidozamias for 10s of centuries. There are pictures of Lepidozamia hopei plants with 40 foot stems, that are literally 2000 years old that have gouges on both sides of the stems going all the way to the top, which is used as a ladder to climb to the top to collect seeds. Coontie, the Zamia native here to Florida, is a Seminole name for the plant because they have made a starchy food out of the stems for 100s of years. They learned how to use them for food by the Caloosas, who were here first. Some people leach the toxins out, some people don't. As you have read, small animals die from eating cycad material. A 15 pound dog will usually die of liver and kidney failure within 48 hours, but they don't have to. A dog like a lab that weighs 90 pounds might get yellow eyes, white patches in the fur, and be really sick for a week, but with proper care, can come out of it and be perfectly fine and live a long time with no extra needed medicine or treatment. Since I talk about cycads to everyone I meet, my vet has heard all about them and she went out and researched a lot and has already saved several dogs from death. I don't know a lot about this subject, but she found some medicine that helps the animal have liver functions while the liver tries to get through the damage. Apparently it is amazing, but hardly any vets know about this and just assume there is no cure. A child is most likely not going to eat a sago seed. Those things are good sized and are rock hard. Zamia seeds would be a different story. You would Hebe to eat a lot of leaf material to be dangerous, and most children or animals won't want to eat that much material. I have designed and installed over 1400 landscapes, mostly in the past when I was younger. Any time there was a concern, I would put known male plants in their landscapes, so, no seeds. Even if you have a female plant, just cut the cone off once it is full size. On coonties, the cones come out in summer, grow until full size, and are usually receptive to pollination around Christmas. The cones will grow the seeds until the cone falls apart around the next November or December. So you have a long time period where all you do is cut the cone off. A revoluta female will become receptive in June and will fall apart around Christmas. Since the female Cycad " cone" is not a tight cone, but actually a cluster if sporaphylls, it is harder to remove, but all you do is remove each sporaphyll, one at a time, starting from the outside in. It may take a little extra effort, but it isn't a big deal. This will get us started anyway.