Welcome to Hidden Valley Hibiscus

Evening Hibiscus Garden From left to right: 'Simple Pleasures,' 'Living Legend,' 'Saffron' 'Monte Carlo' in Page Border

Belle du Jour in a 6" Pot

Our new 2008 Online Store is now open with 130 hibiscus varieties, including 14 new varieties, along with all the care products your hibiscus could need to stay happy and healthy. For the best selection of the year, order now to reserve your hibiscus for shipping in the spring. Happy shopping!

"Just HAD to let you know - the plants arrived today... someone had to wake me up, because I SWOONED... they are so beautiful! Thank you so much for your care, the awesome blooming hibiscus and the amazing customer service on my request and in RECORD time. Please know that I am now a customer and fan forever. Thank you" Diane D

"Thank you so much. I received the plants last week and they are gorgeous. I just placed an order for two more plants. Again, thank you for the beauties." Sheila J

Diane and Sheila are just a few of the many happy HVH customers. Read more customer comments here! The photo above shows the typical size of plants in 6" pots (this is cultivar 'Belle du Jour') at the time of shipping, although size varies by cultivar and we don't guarantee the open blooms. See Terms & Conditions for more information on our guarantees and shipping policy.

Expert Advice... by Charles Black

Charles Black answers hibiscus questions. Charles is a world renowned hybridizer and grower of exotic hibiscus, as well as the owner of Hidden Valley Hibiscus. He has created many award winning hibiscus varieties, such as Heaven Scent, Her Majesty, Simple Pleasures, and Love Story. In this column, he shares his expertise in growing hibiscus with our visitors. Enjoy!

Yellow Leaves ~ Is it Chlorosis?

No question comes to us more often than, "Why do my hibiscus have yellow leaves?" It's a good question and we have dedicated a Yellow Leaves Web Page to answering this question, with a list of the ten most common causes of yellow leaves. The ninth item on that page takes a brief look at what is more properly called "chlorotic" leaves, or just "chlorosis." Today we will look at this common cause of yellow leaves in more detail.

What is Chlorosis?

'Chlorotic Hibiscus Leaves'

The green we see in the leaves and stems of plants is a green pigment called "chlorophyll." chlorophyll is much more than a pretty color. It is the essential substance that a plant uses to produce food and energy from sunlight, fertilizing nutrients, and water. When all of a plant's leaves begin to lose their green color, this means they are losing their chlorophyll, or the ability to produce food and energy for growth and flowering. "Chlorosis" is a special situation where plants have some kind of condition, such as a disease or nutritional deficiency, that causes them to produce less chlorophyll than normal.

How Can I Tell Chlorosis from other Causes of Yellow Leaves?

For our purposes, chlorotic leaves on hibiscus are those that turn yellow but do not fall off right away. Most other causes of yellow leaves result in the leaf falling off shortly after it turns yellow (spider mites, normal replacement of aging leaves with new leaves, extreme weather conditions, etc). When hibiscus leaves become chlorotic, they usually turn yellow between the veins that are visible on the leaf, while the veins themselves remain green. This gives a more mottled impression than a leaf which quickly turns yellow all over and then falls off. Chlorotic leaves will eventually turn brown along their edges, then the whole leaf may yellow and fall off, but this is a very slow process.

What Causes Leaf Chlorosis?

There are many possible causes of chlorosis. These are the causes we most commonly see:

• Iron deficiency in the soil or potting mix
• Magnesium deficiency in the soil or potting mix
• High pH (above 7.2) of the soil or potting mix - or an "alkaline" soil
• Overly wet and poorly drained soil that damages the roots' ability to absorb minerals
• Fungus or other pathogens that damage the roots' ability to absorb minerals or the plant's ability to use them

What Do I Do about Chlorosis?

First, determine the cause of your plant's chlorosis.

• If your plant's soil is overly wet or poorly drained, start by correcting this and see it that solves the problem.
• If the chlorotic leaves are at the ends of the stems, in the newest and youngest growth, then the problem is usually an iron deficiency.
• If the chlorosis shows up in the lower leaves, the older growth, it is most likely a magnesium deficiency.

Chlorosis at the tips of branches in the youngest leaves is usually caused by a deficiency of iron

Apply the appropriate treatment to fix the problem.

• If the problem appears to be overly wet or poorly drained soil, then stop and correct this before trying anything else.
• If soil is not overly wet and it drains well, then try correcting for mineral deficiency.

How Do I Correct for Mineral Deficiencies?

Treatment involves making more iron or magnesium available to the plant. Both are used by the hibiscus to make chlorophyll, which is what makes the leaves green.

• A quick but temporary fix can be achieved by spraying the leaves of the chlorotic plant with either iron chelate or magnesium sulfate, depending on which mineral appears to be deficient.
• A longer lasting fix is achieved by applying iron chelate or magnesium sulfate to the soil or potting mix that the hibiscus is growing in.

Iron Chelate made with FeEDDHA

Both iron chelate and magnesium sulfate can be found in many nursery supply stores, but be careful when you look for them. Only iron chelates made with FeEDDHA are effective in all kinds of soil and potting mix. For your convenience, we have both these products in their optimum form for hibiscus available now in our HVH Online Store. Specific directions are included with the products about amounts to use and how to apply them.

What If These Treatments Don't Work?

Magnesium Sulfate

1. Check the pH of the Soil: Testing soil pH accurately is actually a rather difficult task, best done by a lab experienced in doing so. You can check with the agriculture extension office in your county to see if they will check the pH for you, or we can recommend a lab where you can send a soil sample. Alternatively, you can purchase a pH meter, but be aware that the cheapest ones are notoriously inaccurate, and even the reliable ones require regular maintenance and the knowledge of how to use them properly.

2. If the pH of your Soil or Potting Mix is above 7.2, Treat to Lower the pH : The classic way to lower pH of soil or potting mix is to mix elemental sulfur and iron sulfate (ferrous sulfate) into it. This provides a long lasting fix for the problem and should eliminate iron-based chlorosis for 2 years or longer. The recommendation is to mix the two minerals together, half and half, then introduce them into the soil before watering them in. This lowers the pH and adds iron to the soil. Results are slower to see, but longer lasting and a more complete fix for the problem.

Lab Work - Is It Useful?

'Love Story'

An agricultural lab will do a complete soil analysis for you that will reveal the amount of all the important nutrients contained in your soil, as well as the pH. A soil analysis usually costs less than $100 and can be helpful if you are not confident about the quality of the soil you are planting in. Another useful test that you can have done at the same time is a water analysis for agricultural purposes. This will tell you the water pH and the amount of minerals in your water. The most complete picture of the growing situation can be obtained by sending some leaf samples to the lab where they will be analyzed to see if all the needed minerals are present in the leaf. This is how large commercial operations keep their plants growing on schedule, and obtaining this information can also be useful to the home gardener.

'Ain't She Sweet'

OK, so this sounds like a lot of trouble and expense to go to! We agree! We only recommend lab analyisis of soil, water, or plant leaves for those with stubborn chlorosis problems, or for those with enough money, time, and interest to make the experience of working with an agriculture lab enjoyable.




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Spray Masks

Don't Spray Pest Control Products without One!

Silicone Respirator Mask

If you spray ANYTHING on your hibiscus you need protection for your lungs. Even organic products, such as the Clean Leaf spray and Synergy, put droplets into the air that are breathed in unless a respirator mask is used. If you have used Clean Leaf, you may have noticed that after spraying you do not feel good, which is due to breathing in the fine droplets of oil and soap as you spray. Even though they are not toxic these materials can interfere with proper lung function until they are cleared from the nose, throat, and lungs. It is much better to prevent inhalation of spray material of any type, and even more so for chemical pesticides. To prevent virtually all exposure to sprays you need to slip on a respirator that is fitted with filters designed and certified to use with oils and organic vapors.

After trying just about every type of protective mask out there we settled on an excellent one to offer our customers. It is made of silicone which makes it very soft, comfortable, and form fitting. It is available in small, medium, and large sizes. The replaceable P100 filters that attach directly to the mask are NIOSH approved and rated to remove 99.7 percent of all particles in the air that is breathed. They will filter out oil droplets and every type of solid or liquid mist. The mask comes with one pair of filters that should be replaced annually. You can feel the difference after spraying. That's our experience and we want to make sure everyone knows about and uses respirators if they spray anything on their hibiscus.

In addition to protecting you while spraying your hibiscus or other plants, these masks are excellent for wearing while painting. We have also obtained considerable relief using these when wildfires have sent a lot of smoke our way. They are useful on smoggy days if you need to be outside for awhile.

Our respirator masks come in three sizes. Medium fits almost everyone. Women with very tiny, narrow faces will need a small mask. Men with very large, wide faces will need a large mask. Each mask comes complete with a set of filters, which need to be replaced at least once a year - more often if you spray frequently. (You'll know you need to replace the filters when it becomes hard to breathe through them or when you smell any pest control product odor at all.)

Click here and scroll to the very bottom of the page to see our Respirator Masks.

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HVH Special Blend Fertilizer

Bring out the best in your hibiscus with our HVH Special-Blend Fertilizer. It is especially formulated to meet the needs of hibiscus, with extra potassium to produce more, bigger, and brighter-colored flowers, as well as an array of trace nutrients to build stronger, healthier bushes. It's a special blend we developed here at HVH for our own hibiscus growing in our greenhouses. So many customers asked for it that we have been selling it for several years now. Click here for more information.




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