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Garden Chores by Month

March

3/1/2015

2 Comments

 
Nascent roots and stems
Displace freshly warming earth
Chill nights slow their birth
March in California is the envy of the East Coast. Still bundled against blizzards, they hear about our sunny days and emerging blooms as they look out at a sea of snow. But don’t be fooled by all the new plants breaking ground.
Close-up of almond twigs and stems with buds and several white five-petalled flowers with pink and green spiky centers.
Almond buds and blossoms (Kate Russell)
My last frost date is March 15th, but we’ve already reached temperatures as high as 80°F! To tender young shoots and first leaves (cotyledons), a sudden drop in temperature can be deadly. As tempting as it may be to trim away frost-damaged plant parts in early March, it is a good idea to wait until closer to the middle of the month, just to be on the safe side. Fret not, however, there are many tasks to keep you busy in the garden in March!


​Citrus

Citrus pruning should not be started until after March 15th, but now is the time to seriously inspect for mummies. Mummies are those shriveled up, fuzzy gray oranges that house millions of fungal spores. When removing mummies, try to disturb them as little as possible, or cover them with a plastic bag before removing them from the tree. If a citrus tree shows signs of chlorosis (yellowing) on older leaves, it may indicate a nitrogen deficiency. Interveinal (between leaf veins) chlorosis usually means a micronutrient, such as iron or manganese, is needed. Our soil tends to be very low on iron, but you can’t know for sure without a soil test. After the danger of frost has (nearly) completely passed, on March 15th, give citrus trees a good pruning. Just be sure to keep a lookout for bird nests. It’s that time of year!
A heavily laden Navel orange tree with its trunk painted white. Short hedges can be seen on the right, two light blue planters in the right foreground and a reddish brown fence in the background on the left.
Navel orange tree (Kate Russell)
Compaction

Walking on wet ground causes soil compaction. This is especially true for areas with heavy clay soil. Rather than walking on wet soil, stay on paths, install stepping stones, or just wait for it to dry. Compacted soil is particularly difficult for young roots to move through, and it can cause drainage problems. Also, digging wet soil damages soil structure. The best treatment for compacted soil is a thick layer of free arborist wood chips. Amazing things happen under mulch!
Mulch around echeveria succulents has  been pushed aside to show how heavy clay soil can become dark, loose, and healthier.
Soil protected by mulch regains its good health (Kate Russell)
Disease prevention

Winter and spring moisture provide the perfect habitat for many pathogens. You can prevent diseases, such as fireblight on apples, pears, quince, and loquat, with fixed copper sprays. You can also reduce the chance of powdery mildew on grapes by applying sulfur at this time.


Feed young trees

As young trees continue putting out new roots, shoots, and leaves, they will benefit from being fed in March. Check the specific species of tree for more information on how much fertilizer should be provided. Since my soil tests indicate that everything is present in abundance, except for nitrogen and iron, those are the only two I add. Money saved. Environment protected. Check.


Irrigation

Another common March task is to inspect and repair sprinklers, drip systems, and water collection systems. How do you know if you have an irrigation leak? It can be difficult to spot, especially if it is small. The most common indication is an area that gets and stays wet or green longer than everywhere else. Sprinklers should be aimed so that they do not hit tree trunks, walkways, driveways, or sidewalks. The former can cause fungal diseases and the latter creates wasteful urban drool. 


Pruning

March is also a good time to prune out dead branches and twigs from fruit and nut trees and ornamental trees and shrubs. It is easier to see the structure of each plant before it is covered with leaves. The only exception is those trees susceptible to Eutypa dieback. Pruning grapes or stone fruits, such as apricot or cherry, before the rains are completely over can create an opportunity for infection. I know it's hard to wait, but you should.​
Seeds

March is an excellent time to start planting your summer garden. In warmer regions, you can still direct sow many cool weather crops, such as beets, broccoli, cabbage, carrots, cauliflower, chard, lettuces, spinach, bok choy, fennel, kale, mustard greens, parsnips, and turnips. And it's not too late to install that asparagus bed! March is an excellent time to add cilantro, dill, and parsley to your garden, but wait for warmer temperatures before planting basil and peppers. Potatoes and radishes can be planted now, and you can start tomatoes and peppers in pots, but only if you can protect them from the nighttime cold. Otherwise, wait for April, when soil temperatures rise and the serious planting begins! As you dedicate seeds to a specific location, make sure to read the seed package labels for things like mature size, thinning requirements, and sunlight needs, and be sure to use plant markers!
Large homemade wooden seed box with paperboard dividers for each moth and a planting schedule glued to the inside of the lid.
Homemade seed box (Kate Russell)
Roses

If your roses haven’t already started producing leaves and blooms the way mine have, March is a good time to prune them for better airflow and structure. You can also start feeding roses in March, and you may need to spray for black spot. Black spot is a fungal disease that loves moisture. As dew collects on rose leaves, the fungus reproduces astronomically. You can use neem oil or a fungicide. My biggest rose problem is rust. Rust is another fungal disease that is easy to identify. Just look on the underside of leaves. If you see bright orange dots, your roses are infected. Rust is a pain to control. The only solution I have found is to spray with Bt (Bacillus thuringiensis)bacillus-thuringiensis-bt.html. It goes by several names in stores. The two most common are Serenade and Thuricide. You have to apply it very frequently, without fail, to get good results. But my husband loves my roses.
Mottled gray, black and white background. Overturned rose leaf stem showing a few leaves with 2 or 3 bright orange growths which indicate the presence of rust, as fungal disease.
Rust spores on rose leaves (Kate Russell)
Slugs and snails

Our warming temperatures and moisture work together to create the perfect habitat for slugs and snails. These mollusks can devastate seedlings in a single night, so be prepared. I urge you to follow the link to slugs and snails to learn more about the specific ingredients in different bait products. They are not created equally, and some can harm pets. Choose accordingly. Be on the lookout for pillbugs, too.


Soil test

If you have not conducted a soil test recently, now is the time. Find out what is in your soil before you start adding plants or fertilizer.. This will help avoid nutrient imbalances that can wreak havoc on plant health.


Weeds

Walk through your garden in March and you are sure to see weeds coming up in every location imaginable (and a few unimaginable places!). Your Number One March garden task is weeding. Since some weeds can go to seed in as little as a week, now is the time to cut them off at ground level with a hoe. Wait until later in the season and thousands of seeds will already be sown. Healthy weeds make great additions to the compost pile. Personally, I feed them to my chickens.

​
​Enjoy the early blossoms!
2 Comments
Michael link
4/22/2022 06:38:15 am

Thanks for sharing this useful information! Hope that you will continue with the kind of stuff you are doing.

Reply
Kate Russell
4/29/2022 07:24:57 am

Thank you, Michael! It's so nice to hear that this project of mine is appreciated.

Reply



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