All posts by Jan Nelson

I am a landscape designer and consultant in the Santa Cruz mountains in California. I write a weekly gardening column for the Press Banner newspaper. I am also a Calif. Advanced Certified Nursery Professional and managed The Plantworks Nursery in Ben Lomond, Ca. for 20 years.

Grapevine “Christmas Tree”, late Bulbs & Rosemary

 It’s great to see so many magazines and TV shows showcasing quick, inexpensive Christmas gifts and decorations to make from simple objects.  As we all try to reduce, reuse and recycle , here’s  an idea that you can use to decorate your deck or front porch with items you already have.

What’s more "green" than recycling your own garden cuttings?  You probably have a large pot where the plants are just about through for the season.   Pull out the spent plants but keep the soil.  You’ll be making a Christmas "tree" from a tomato cage turned upside down and secured with large U-shaped staples poked into the pot’s soil. Tie the wire prongs that are normally sunk into the ground with twine to make a pointed top. 

 Once the cage is anchored in place you can weave prunings from grapevines or honeysuckle in and around it.  Any vine will work as well as  long flexible branches from shrubs like cotoneaster, willow or abutilon.
If you have an electrical outlet nearby you can weave small lights throughout the tree.  If you want to get fancy, poke dried hydrangea flowers or berry sprigs or rosemary cuttings into the "tree".    After the holidays, you can plant primroses in the container and store the tomato cages for next summer. 

 It’s not too late to plant bulbs.  We get enough cold around here for many more months so the bulbs will get enough chilling even though you’re getting a late start.  The worst that can happen is the blooms may be slightly smaller and bloom on shorter stems.   I always start my bulbs about now as the squirrels have buried most of their acorns for the season and tend to leave my pots alone.  If they do discover them, I put gravel over the the surface and that seems to stop the party.   I plant lots of pots because the color will be so welcome in early spring. 

A simple ( read lazy ) way to plant that I’ve always had success with is to reuse the soil in a pot that just finished up like impatiens or other annuals.  Some I plant with cool season color but many, especially the glazed ones, I take out half of the soil, layer some bulbs, and pack the top with the rest of the soil.  Voila !  Instant spring bouquet in less than two minutes.  If you haven’t planted any bulbs yet,  do go out and get some now.  You’ll be very glad you did.

A word to the wise:  protect against killing frosts that often hit this month.   Watch out for still, starry nights and be prepared to protect tender plants with frost blankets.   Even a sheet, tarp, cardboard box, or regular blanket will help. If you do use plastic, make sure it is supported by poles and not draped right on top of the plant.  Better yet,  sink four 1×1 stakes to make a frame around tender plants,  then you’ll be ready  to throw something over quickly on a cold night.  Plants must be watered adequately to survive a freeze.  Drought stressed plants are more susceptible to damage. 

A plant that’s hardy, drought tolerant, blooms in the winter and makes a nice wreath, too, is the rugged rosemary.  One of the most versatile of all herbs, rosemary can be used in a variety of ways in both the garden and kitchen.  You can use an upright version like for a deer resistant screen.  Low. prostrate types make great ground covers.  And they do well in pots on the deck or outside the kitchen door.  Native to the Mediterranean region, rosemary tolerates a wide variety of growing conditions from hot sun to partial shade  and survives down to around 15 degrees.   It will accept regular watering as long as there is good drainage.  You can add it to a mixed perennial bed or delegate it to the back forty.  Rosemary will flourish for decades in your garden but too much fertilizer will result in a shorter-lived plant.

 Harvest leaves for cooking anytime.  Plant some by the barbeque so you can toss plant sprigs over the coals to flavor food as it cooks.  Or use rosemary branches dipped in sauce to baste grilled food.   Mmm… yummy.

Japanese Maple tips for fall foliage

 If the foliage on your  Japanese maple recently dried up before turning color or during the process, the following question I recently received may be of interest to you. The reader  was concerned because he had had some dieback in early spring while his maple was leaving out.  So when his tree fritzed this month he thought the tree might be having more fungal problems.

Leaves change color when they are going into winter dormancy.  When nights get long enough, leaves  develop a corky layer of cells between the leaf stalk and the woody part of the tree.  This slows the transport of water and carbohydrates.  The manufacture of chlorophyll is slowed and the green color of the leaves begins to fade, allowing the other pigments to show through.  Since the transport of water is slowed down, food manufactured by the remaining chlorophyll builds up in the sap of the leaf and other pigments are formed which cause the leaves to turn red or purple in color, depending on the acidity of the sap. 

 For example, sumacs and California wild grape almost always turn red because red pigments are present and their leaf sap is acidic, While many of the oak and sometimes ashes will get a purplish color because the sap is less acidic.  Trees like birch don’t have much orange pigment, so they appear mostly yellow in the fall.  Others don’t have much yellow pigment, and turn mostly orange or read.  Some trees have a balance of pigments and look pinkish.  The brown color or many oaks can be attributed to a buildup of tannins which is a waste product in the leaves. 

Getting back to that poor Japanese maple with the dried up leaves,  the whole process of fall coloring can be disrupted by wind and rain coming at the wrong time.  Japanese maples have a more delicate leaf than some of other trees and are more susceptible to the elements of nature at this time. Rain and wind during the display will put a quick end to the autumnal display.  The good news is that your maple will be just fine next year.

Japanese Maple tips for fall foliage

 If the foliage on your  Japanese maple recently dried up before turning color or during the process, the following question I recently received may be of interest to you. The reader  was concerned because he had had some dieback in early spring while his maple was leaving out.  So when his tree fritzed this month he thought the tree might be having more fungal problems.

Leaves change color when they are going into winter dormancy.  When nights get long enough, leaves  develop a corky layer of cells between the leaf stalk and the woody part of the tree.  This slows the transport of water and carbohydrates.  The manufacture of chlorophyll is slowed and the green color of the leaves begins to fade, allowing the other pigments to show through.  Since the transport of water is slowed down, food manufactured by the remaining chlorophyll builds up in the sap of the leaf and other pigments are formed which cause the leaves to turn red or purple in color, depending on the acidity of the sap. 

 For example, sumacs and California wild grape almost always turn red because red pigments are present and their leaf sap is acidic, While many of the oak and sometimes ashes will get a purplish color because the sap is less acidic.  Trees like birch don’t have much orange pigment, so they appear mostly yellow in the fall.  Others don’t have much yellow pigment, and turn mostly orange or read.  Some trees have a balance of pigments and look pinkish.  The brown color or many oaks can be attributed to a buildup of tannins which is a waste product in the leaves. 

Getting back to that poor Japanese maple with the dried up leaves,  the whole process of fall coloring can be disrupted by wind and rain coming at the wrong time.  Japanese maples have a more delicate leaf than some of other trees and are more susceptible to the elements of nature at this time. Rain and wind during the display will put a quick end to the autumnal display.  The good news is that your maple will be just fine next year.