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18

This is called Marcescence. Some species of trees retain their old leaves longer than others, and young trees may retain them longer than old trees. In the UK, "copper beech" trees (with naturally brown or purple coloured leaves even in summer) which are sometimes used for ornamental hedges often retain the old leaves right through the winter. It may be a ...


14

What's done is done, but in future years, as others suggest, collect up the leaves and compost them separately, either in a contained heap or in binliner bags with holes in the bottom. Leaves should be wet, crammed in a binliner, the tops tied shut, holes poked in the bottom, then left in a corner somewhere to rot down over a year or so, by which time they ...


14

The leaves in the picture looks like ferns. As you may know, ferns use spores to reproduce. It appears to me that it is just the Sori under your leaves (the Sori is made up of groups of Sporangium, which produce and contain the spores). Nothing to be worry about! You can even try to grow more from these.


13

I live a long ways from Northern California but these symptoms are the same for citrus grown anywhere in the world when the soil is alkaline. There are some great pictures here. The most likely cause is a manganese deficiency Leaves turn yellowish overall but larger veins remain slightly green where manganese is deficient. Zinc deficiency symptoms are ...


13

Leaves are good compost if they are shredded. If left as is on garden beds or lawns they tend to clump and can smother the smaller perennials. To do my fall clean up I put a bagger on the mower and go at it. I can put up to six inches (12 cm) of fluffy shredded leaves on top of rhubarb and by next June or July the worms have eaten it up. They will do the ...


12

These are aphids whose lifestyle is to live off the plant juices in the leaves. They can be found almost everywhere during the growing season and prefer plants with soft leaves. You will rarely find them on plants with hard waxy leaves as the cuticle is too hard to bite through. Control is easy with 5 ml dish soap to 1 litre of water. Agitate and spray ...


12

It looks in your photos as if you have it in a small cup with no drainage. I would surmise from that & the condition of the leaves that it is over-watered and probably suffering from root rot. Replant it into a container with drainage holes with a rich, well draining potting soil. Keep the soil damp but not soggy and give it some time.


11

Looking closely at the last picture, there are clear dark concentric circles around the black spots which is textbook early blight. It is a trademark of the disease. Blight has been bad, really bad this year. Your best chance is unfortunately to pull the plants and save any remaining healthy plants. Then going forward there are some key cultural ...


11

That looks like a squash of some kind. It will probably send out runners and spread quite a bit. The fruit should be edible, but I can't really tell what it will look like. It may be more like a pumpkin (it resembles Cucurbita maxima).


11

Looks like natural variegation to me...looks like a typical golden pothos (Epipremnum aureum). It's supposed to have these marks. They show up and contrast best with good lighting. Don't worry about this - it's natural, and healthy.


11

I use a lawnmower with a bagger. The blades chop the leaves and reduce the volume by up to 80%. The finely shredded leaves are great mulch for plant or vegetable beds. I cut my grass low in the fall as we get a lot of snow and this reduces the chance of snow mould. You may have to adjust your cutting height depending on the amount of leaves. This ...


11

Nothing to worry about, if you're referring to the semi circular red area on the leaves - these are zonally marked Pelargoniums, and that's what they should look like.


10

You've got to pay attention to any insects in the area and how moist the soil is to work out which of two possible reasons for the purple rain. Phosphorus deficiency You've got this if the leaf veins are purple and overall sport a purplish tint. "Recognizing Tomato Problems - Colorado State University". Most likely if there are no insects around, it's ...


10

Yes, if they get matted down - just like covering the grass with anything else would - by reducing sunlight and air circulation. Less importantly, leaves will compete with the grass for nitrogen - they consume it in decaying. Oak leaves are especially bad because they're acidic. Some folks have good results with shredding leaves and leaving them on. ...


10

The only time you usually remove leaves which are slightly damaged or part dead is if the plant is highly ornamental and it's detracting from its appearance, or the leaf is damaged by some kind of infection or invader. Otherwise, just wait for the leaf to shrivel and fall off naturally, or remove it when it's at that stage.


10

Urtica dioica - Stinging nettles...! Very valuable wilderness food. Truly! If you grab a leaf touching just the topside you can mash it (eliminating the chemicals on the underside of the leaf) roll it in a ball and eat it! We had to do this in Wilderness Survival classes. Interesting. Even better, this stuff is almost exactly like spinach steamed. ...


10

Hope this is what you were looking for. These pictures are all from the site of the Colorado Master Gardener Program. (There's much more extensive information there than I can copy here.) They have more diagrams, and the explanation are very good. You can also print them out: http://www.cmg.colostate.edu/GardenNotesUpdate.shtml This one gives definitions ...


9

The burnt/scorched looking leaves could mean a lot of things. My first guess would be over fertilization either at the nursery or by you. Blueberries need acidic soil at a pH level of about 4.5-5. If you used a regular high nitrogen fertilizer, it would be terrible for the plant and the leaves can get "burnt" from the fertilizer. Secondly, blueberries like ...


9

One good use for oak leaves is as an overwintering blanket for tender plants. Unlike maple leaves which tend to lie flat and create an impermeable sheet, oak leaves curl. With enough of them and a tomato cage, you can make a nice blanket which will protect your plant from the desiccation of winter winds


9

Assuming this cherry tree is not a Japanese species, for these are rarely attacked, this looks like Cherry Blackfly. Its a sap feeding aphid, Myzus cerasi, which overwinters as eggs on fruiting cherries and some ornamental species such as Prunus avium and P. padus. Fruiting trees used to be sprayed with a tar oil wash in winter to control the eggs, but a lot ...


9

That is Early Blight, Alternaria solani. The earlier you treat, the better the control, as a strong infection will build up resistance to the fungicide. Here's what to do: Remove all leaves showing signs of early blight (yellowing, dry margin, large to small round dead spots.) Do not touch the unaffected leaves with the removed portions, or your hands ...


9

No, don't cut this one back,it'll ruin its structure, and anyway, they bleed like crazy if you cut them. The thing to remember about any Ficus is they're fussy - they absolutely hate a change in conditions, and in particular, a draught. Indoors, most will drop leaves when the seasons change, so in spring and again in autumn, and mostly because the heating ...


9

That is magnesium deficiency. It can also cause yellowing between leaf veins. Treat by watering Epsom salts (magnesium sulfate) at a rate of 1 cup per every two gallons, with every watering until the symptoms leave. See a comparison pic:


9

This is some species of Acacia. The strap-shaped leaves are actually petioles (the leaf stem) which have expanded and flattened, and do not have an actual leaf blade. This type of flattened petiole is called a phyllode. The only acacia I've ever seen with these two different leaf forms is koa, but several (maybe most?) Australian acacias also behave ...


9

I let the grass grow a little higher than usual for a week or two before the leaves fall, set the mower on the highest setting and mow twice at that setting. This mulches the leaves in place. I do this for subsequent weeks, progressively lowering the blade. By the time I am ready to use the bagger a lot of the material is composted on the lawn; since ...


8

It looks like a oak apple gall, a leaf gall commonly caused by the larva of a wasp (Amphibolips confluent and others). The larva lives inside, both causing the gall and feeding off it. Eventually, it tunnels its way out. When the gall matures, it turns reddish (apple-like) and then brown. According to Insects That Feed on Tree and Shrubs by Warren Johnson ...


8

Looks like you have plenty of other foliage, you can either leave the leaf alone or just pull if off. Leaving the leaf on may slightly increase your plant's infection risk as the exposed surface is fairly large, but honestly plants are pretty good at preventing that when its only a minor injury. The benefit of this, as mentioned in a comment is that the ...


8

Mulch the soil around the plant. This greatly reduces moisture loss, and (with some materials) also reduces weeds. Opinions vary on best materials. See this post. For myself, I don't use -cides on my lawn, and I bag the clippings and use some of them on the garden. You need to make sure to not put too much on at one time, especially when damp, because it ...


8

You might try sanding the soil..kinda like pounding spike holes into the ground and adding sand into the holes..pound at least 100 holes for a tree this size down at least 3ft with a metal spike .. fill in with fine sand..and maybe some fertilizer (kinda like a fertilizer spike with sand setup). I would use osmocote type to make sure it is released slowly. ...


8

I turn the floor over to Mr. Chas. Darwin: “Certain plants excrete sweet juice, apparently for the sake of eliminating something injurious from the sap; this is effected, for instance, by glands at the base of the stipules in some Leguminosæ, and at the backs of the leaves of the common laurel. This juice, though small in quantity, is greedily sought by ...


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