Monthly Archives: January 2012

gardening tips, gardening zones, soil

Zones for the Santa Cruz Mountains

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Gardening is a tricky thing up here in the Santa Cruz Mountains. Recently I got an inquiry from a new resident to the area. She moved up here last year from the west side of Santa Cruz. Not that far away on the map. A world of difference in soils and climate. She lamented, "I Can't believe the difference in the soil here. I lived a mile from the beach and now that I'm miles away, I have the sandiest soil ever."  Welcome to our wonderful world.

Our soils were formed from marine deposits and from molten rock emerging from the earth's crust. Areas underlayed with shale creep and slide during wet weather. Serpentine and granite soils crisscross the mountains.
What's a gardener to do?

It helps to know which zone you garden in. So here's a review. Sunset Western Gardening Guide is confusing as our area has many microclimates and their map is not detailed enough to reflect this. They even show Felton as being on a ridge top instead of on the valley floor. Hopefully, the new Sunset book out this month will be more accurate. Here are some tips to help you determine which zone you live in.

Zone 7  has the coldest winters in our area.  Very high ridge tops like the Summit area and the most northern portions of Bonny Doon lie in this zone.  My records show average winter lows ranging from 15-25 degrees based on 20 years of input from gardeners in these areas.  This does not apply to other areas of zone 7, just those around here.   Record lows have occurred during freezes in 1990, 1996 and 2007 but as gardeners we rely on average highs and lows to help guide our planting times.  Spring weather comes later in this zone with the growing season mainly from April – October.

Zone 15 – this zone encompasses most of our area.  Winter lows average 20-30 degrees. The valley floor of both San Lorenzo and Scotts Valley lie in this zone and are what I call "a cold 15".  Cold air sinks and is trapped in these areas. Often there is damage to the tips of oleanders and citrus while gardenias and tropical hibiscus need extra protection.There are warmer parts of this zone, though, where the growing season starts in March and ends in November.  These areas rarely get a freeze after March 15th or before Thanksgiving.

Zone 16 – those who live up off the valley floor but below ridge tops live in this "banana belt". Pasatiempo also falls in this thermal zone.  Light frost can occur during the winter but mostly the winter lows in this zone stay above freezing. Lucky you.

Beside the zone you also need to note how much sun or shade you get during the growing season- April through September. Most plants can survive without sun during the winter as they are either dormant or semi-dormant. It's those areas that get a blast of sun from about 11 am to 4 pm in the summer that you need to plan more carefully for.  

There may also be microclimates on your property. Areas in your garden that are several degrees warmer than other spots. Maybe a brick wall or the top of a slope from where cold air drains generates a few extra degrees.  Planting a citrus at the top of a slope that drains away the cold will make your tree much happier than if planted in a low open area.

If you have questions about which zone you are in, email me and I'd be happy to help.
 

fragrant plants, pruning tips, roses

Fragrant Roses & How to Prune Them

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I'm daydreaming about the flowers of spring and summer and what could be more impressive than a big, fragrant, jewel-toned rose? There are some great new ones out this year that I have my eye on. Maybe you have room for one more.

Fragrance is a requirement for me when it comes to roses. First thing when we admire a beautiful rose is to bend over and smell it. Sure vase life and petal count are important but who can resist a fragrant rose? With that in mind, several of the new varieties out this year fit my bill. Consider one of these for your garden.

Orchid Romance is a small, medium pink to lavender floribunda rose. It has a strong citrus aroma on warm days. Grown on its own root it has good disease resistance and holds up well in a bouquet. Medium large, very full flower clusters bloom in flushes throughout the season.

Sugar Moon is an elegant pure white rose with huge, full, classically formed buds. Saturated with an intensely sweet citrus and rose fragrance the scent is said to nearly bowl you over. Long cutting stems makes this a perfect addition for the cutting garden. Superior disease resistance is another plus for this new rose.

Cold weather earlier this month has kept roses in the garden dormant but now is the time to prune them before they start leafing out which wastes plant energy. I want them to produce lots of roses on a compact shrub not just a few exhibition size so I prune shrubs moderately.  Heirlooms, however, require less pruning because their open look is part of their charm.  Remember your goal is to keep the center of the plant open for good air circulation.  Aim for a vase-shaped bush with an open center by cutting out crossing canes, spindly, weak, broken or diseased stems as well as dead wood. Cut back the remaining stems by about one-third, cutting canes at a 45-degree angle, just above an outward facing bud.

Don't worry whether you're pruning job is perfect. Roses are super forgiving and you can trim them up again later. I once helped prune the rose garden at historic Gamble Gardens in Palo Alto. To revitalize the old shrubs we sawed out most of the beefy canes. I didn't think they could recover in time for the big May bloom but they did and were spectacular. Roses are like redwoods -you can't kill one- they're the energizer bunnies of the plant world.

Climbing roses require little pruning. Cut out extra stems if there are too many and also cut back long established canes to where they are slightly thicker than a pencil. Then cut each side stem down to several inches. This will cause the cane to flower along its complete length for a beautiful spring display.

Remove any leaves that may still be clinging to the bush. Rake up debris beneath the plant and discard to eliminate overwintering fungus spores. It's a good idea to spray the bare plant and the surrounding soil with a combination organic horticultural oil to smother overwintering insect eggs and a dormant spray like lime-sulfur to kill fungus spores. If you usually only have problems with black spot you can use a mixture of 1 teaspoon baking soda with a few drops of light oil in 1 quart water and spraying every 7 to 10 days.

And that's all there is to it. Email me if you have any questions.
 

bare root plants, edibles, gardening tips, organic fertilizers, organic gardening, soggy soil, sustainable gardening

Bare Root for the Santa Cruz mountains – part deux

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There are few things in life that are as optimistic as planting a fruit tree. Knowing your new apple tree might survive for 80 years and a pear tree up to 40 years makes your job as steward take on more importance. So it's a good idea to do some planning on where and how you plant your new addition.

First of all, consider how your soil drains. Many fruit trees are forgiving as long as they're not sitting for days at a time in water logged soil. Moist is fine but if you dig your hole, fill it with water and it doesn't drain in a day or less then consider planting on mounds. Cherries especially need good drainage with apricots being close behind.

Choose fruit trees that ripen at different times. You don't want so much fruit in July that you're begging people to take it or leaving it on their doorstep and running like the zucchini people. Some fruit trees need a pollenizer to bear fruit so keep this in mind and ask  when you buy your tee. These are just a few suggestions. Let your taste buds be your guide.  
 
Take a look around your property for spots where there is  enough sun in the growing season to make  your new plant  or tree happy. Don't worry if you don't have much sun in the winter time,  the plants are dormant then anyway. It's the growing season, from approximately April to September, when your site should get 5-6 hours minimum of sun.

How much space do you need? Trees come in different mature sizes. Room is not so much a factor as you can find dwarf and semi-dwarf varieties if need be. Nut trees are the exception and do require more space. There are fruit trees available also that have already been espaliered to grow flat against a fence or wall. Plus a fruit tree can serve double duty as a focal point or shade tree if it is limbed up enough to walk under.  Semi-Dwarf trees are 2/3 the size of a regular tree (15-20ft typically although you can prune a little in the summer to keep them shorter) .  This is the most popular size as pruning and harvesting are within reach of medium size ladders. There are many dwarf varieties of peaches, nectarines, apples, almonds, cherries also available that range in size from 6 ft. – 12 ft.

Selecting a more mature bareroot tree will give you fruit  sooner than one that has a trunk of only 1/2 inch across.  
Trunk caliper of 5/8 inch is a good size. If you are planting a home orchard it may be more economical to buy smaller sizes but you'll have to be patient for your first harvest. Dreaming about that row of flowering cherries or plums bordering the sides of your driveway?  You'll realize that vision sooner by going with the larger trees.
 
So you've chosen your dream tree, it's wrapped in a plastic bag to transport home without drying the roots, you've dug a hole large enough to accommodate the roots, amended the soil if necessary and pruned off any damaged roots. Now what? Find the graft at the tree's base and make sure when you fill in the hole with soil that the graft is above grade. Make a watering ring around the tree and flood it with water settling in the roots and eliminating air pockets. Don't water again until the soil is dry an inch or two down.  Winter rains may take care of this for you for a long time. Cherries and apricots need excellent drainage and may need to plant them on a mound to ensure this. If you can't plant your new tree, shrub, berry  or rose right away be sure to cover the roots with moist soil.

Only stake your new tree if you live in a windy area. A trunk will attain a larger diameter if it's allowed to move slighly in the wind. Usually it's not necessary to prune a young tree much while it is trying to grow new roots. Trimming a long branch or leader by a third is OK if necessary. You can start limbing up after a couple of years if you wish.

Add both edibles and ornamentals to your garden. You'll be investing in the future.  Blueberries offer more than yummy berries to eat.  They make beautiful hedges with gorgeous fall color.  Include two types for better production like a Berkeley, Bluecrop or Blueray.   Other edibles that are available now are asparagus, artichokes, strawberries, grapes, blackberries, boysenberries and raspberries.  

Plant something new while it's available bare root.  You won't be disappointed.