Healthy Plants: Q&A from Mr Booster

How to grow a happy Red Jade Vine?

Q: My Red Jade Vine has the leaf tips turning brown. I water this plant four times a week and I am using a half a teaspoon of miracle grow bloom booster 15-30-15 per 2 gallons, every two weeks. In the beginning I had to water this plant off city water in South Fort Myers. Over the last two months I picked up a dechlorinator buggy plus threw that on my hose and I've been watering it with that but it didn't seem to make a difference. I put this plant in the ground last September. It has three shoots that run into the top of the tree, so it is growing but leaves seem to drop off down low at the base of the vine and the brown tipping running into the top of the plant. But not the newest shoot its leaves are solid green all the way at the top. Thanks for any advice.

A: Mucuna benettii - Red Jade vine - is not the easiest plant to grow, and we are glad your vine is growing well. For those who love this plant but not ready to face all challenges, we recommend its cousin - Camptosema grandiflora - Dwarf Red Jade Vine, which is much hardier and easier plant.
We looked at the photos and these are our thoughts.

1) The top of the plant with green fresh leaves definitely indicates that the plant is generally healthy and vigorous.
2) Dry tips of the old leaves may indicate excess salts in soil, in combination with the summer heat that it went through. Based on your feeding program description, that fertilizer may create a problem. Water soluble traditional fertilizers are EDTA-chelated which often causes nutrients lock up in soil and leaf drop. Try to stay away from that fertilizer for a month and let the rains and/or irrigation water flush the soil for a couple of weeks.
3) Red Jade vine is a very sensitive species. Normally, during hot season it is safe to use traditional fertilizers, especially slow-release granulated. However, with this plant we recommend you to switch to more delicate formula and use only liquid fertilizer.
SUNSHINE Megaflor - Bloom Nutrition Booster will be the best. It is safe to use it as frequent as with every watering! It is amino-acid based, and will be totally consumed by the plant without nutrient lockup.
4) Another cause of dry leaf tips may be micro-element deficiency.
Megaflor booster already has all necessary micro-nutrients in it, plus you may apply some extra: SUNSHINE Superfood.
5) You may continue using regular water for watering (including city water) as long as you use amino-acid based plant food and supplements: they improve soil acidity (what tropical plants like is acidic soil, and Florida soils are alkaline). Additionally, to improve soil acidity which can be critical for this Mucuna species, you may add 1" layer of pure peat moss on top of the soil around the plant. Please keep us in loop how the plant is doing. It is pretty rare species in cultivation and we will be happy to help you to keep it thriving.

Spanish Lime Tree

Q: Do I need two plants of the Spanish lime to have fruits? Do you have a grafted tree that I would only need one plant?

A: From our experience with Spanish Lime trees - Melicoccus bijugatus, fruiting habit really depends on variety. There are self-pollinating varieties that only require one tree. Seedling usually require cross-pollination between two trees for better production. It doesn't mean that one tree won't bloom or fruit - it will, but production may be lower than if they were cross-pollinated.
The Spanish Lime trees we currently have in stock are seedlings from a good, self-pollinating variety Key West, however, only grafted trees are precisely true to variety since they are technically clones. Seedlings normally take a few years (3-4) until they start fruiting. Spanish Limes don't have to be grafted to produce quality fruit, however, grafted trees may take less time till they fruit.
This species is really hard to obtain and we do not have any grafted trees now, and probably not for another year. So if you really want this fruit tree, you may want to try at least with a seedling. We only have a few left in stock and many people want them. Otherwise, you may sign up for the wish list and wait until we (hopefully) have grafted specimens (enter Melicoccus bijugatus in wish list).

Growing Stephanotis and cold protection

Q: I bought from you 3 plants Stephanotis How do I protect them from this low temperature now? I live in Ft Myers Beach.

A: In Ft Myers Beach, you have frost-free winters. You don't have to worry about cold protection for the Stephanotis. It is pretty cold hardy plant in spite of being a true tropical (it enjoys Hawaii environment for example). From our own experience, Stephanotis can even take a light frost for a short period of time without any damage.
You can keep this plant either in a pot or plant in the ground in a nice sunny location for more profuse flowering. It can climb a tree, a fence, or a pagoda.
However, keep in mind that during cool weather you need to reduce amount of watering. Wet + cold is a bad combination for plants. Water again only when the soil gets slightly dry. In summer time, extra water is not critical because it evaporates quickly with high temperatures.

Mango ID and ripeness

Q: As the World's Leading Authority on Tropical Plants, I hope you can help us out. We obtained a mango tree from a City giveaway, and planted it a few years ago. This is the 1st year it has produced fruit. They are almost all green color, & range from 6-7 inches in length. Attached are a few photos of the tree & its fruit. Please help to identify the type, and how to determine when they would be ready to pick. Or should we just wait until they fall off of the tree?

A: If the tree is grafted, it normally starts flowering within a year after planting. If the tree is over 6 years old and just now started fruiting - chances are, this is a seedling (possible at giveaways) without specific variety. However the fruit looks pretty good size and shape, hopefully it tastes great. You will find out soon!
Based on the pictures, there maybe a few possible choices, including varieties (or their seedlings) Keitt, Rosigold, it can be even Lancetilla if fruit grows bigger than 7" long. The next step would be, wait until the fruit get some color, then it will be easier to narrow down the variety. Also see if there is a lot of fiber or no fiber.
You may wait until at least one fruit ripens on the tree and let it fall naturally - that will be the color (can be all green, but in your case it looks like it's turning yellow blush). After that, you may pick full size fruit before they fall and let them ripen on a kitchen table. Usually once the fruit starts showing color, it is close to ripening. For all-green varieties, just wait till fruit grows to maximum full size. You may also check if the fruit gets softer to touch, then it's ready.

Healthy Plants: Q&A from Mr Booster

What is an ideal potting mix?

Q: A few years ago, I purchased a Barbie Loquat from you, and I'm pleased to say it's been growing very well. I now have several loquat seedlings. I have read that a well-draining medium should be used, and I have found that the various formulations provided on the web for such medium seem vaguely reminiscent of the recipe provided in your transplanting instructions. Therefore, I would like to retrieve your recipe, unless you could recommend an even better one?

A: The main requirements for a good potting mix are:
- perfect drainage, allowing air circulation that is so necessary for healthy roots; oxygen circulation helps to avoid root rot
- water retention: to keep nutrients in soil
- low pH (soil acidity) which is important for most tropical plants
- adequate amount of organic matter in the mix, in combination with proper fertilizer program

In our nursery we experimented with many different potting mixes for the past couple decades. We ended up with an ultimate mix for tropical container plants that we designed ourselves. This custom mix is called -

Abundance - TopTropicals professional soilless potting mix

It meets all the requirements above which makes it a perfect mix. All our plants are happy with it. Abundance is a professional quality (nursery-grade) potting mix with great drainage characteristics, ideal for any tropical plants. It is organically derived soil-less mix, free of any additives.
Ingredients are:
- fine Canadian peat moss
- coconut coir
- perlite
- aged pine bark (soil conditioner).
See more info on soil mixes.
We have this mix available for purchase in different packaging sizes - 2, 3, and 7 gal bags.

Besides proper potting mix, all container plants require regular fertilizing. We recommend the newest, scientifically balanced fertilizers Sunshine Boosters that are natural, eco-safe, great for all edibles and organic gardening. They are safe to use with every watering, provide all necessary elements for plant daily needs, and won't burn the roots.
For your loquat tree, consider Sunshine C-Cibus, it boosts both flowering and fruit production. Loquat is Winter-Spring bloomer, hopefully you will get some crop soon!

See more information about potting mix science

Plant of the Month:

Fragrant Dombeya Tree

Every tropical gardener wants to have a Dombeya (a.k.a. Tropical Hydrangea) in their collection - an easy to grow, fast growing winter bloomer. These plants don't require any special care, thrive in neglect in both sun or shade, and flower profusely during Fall-Winter months - what an awesome treat! Dombeyas are also wanted for their vigorous growth habit - they can cover unwanted view in no time, fill and empty corner in your yard, create a colorful tropical display, and attract lots of butterflies and bees. They are not afraid of water logging, in fact the more you water them, the faster they grow. The large tropical leaves are beautiful - soft, fuzzy, with shallow, maple-like lobes. This plant is tolerant to both light frost and periods of drought.
Most Dombeyas grow into round, dense bushes, but this one variety of is very special. Dombeya burgessiae from South Africa actually grows into a small (10-15 ft), pretty, upright tree that is covered with beautiful blossoms during winter. The flowers are creme color with raspberry centers, attracting lots of pollinators, and what is the most special - they are sweetly fragrant! What a beauty!

Surround yourself with aromatic cloud of Dombeya winter blooms!

Musa ensete Maurelli - Red Abyssinian Banana

by Onika Amell, tropical plant expert

Q: I am looking for a colorful, tropical plant with in particular, coarser texture, to add to planting beds next to my decks and around my swimming pool. Any suggestions? I am located in St. Petersburg, FL.

A: Consider incorporating some fast growing Red Abyssinian Banana, also known as wild banana or Ethiopian banana. This is a fantastic ornamental from East Africa and an excellent choice to create a tropical feel and to add coarse-textured foliage. This plant is not a true banana and therefore does not produce any edible fruit. American gardeners were rather slow to discover this enormous perennial, but finally woke up to them over the last decade to a point where they now are considered to be one the most beautiful ornamental banana plants for the landscape and for good reason...

CONTINUE READING >>

Cold protection of tropical container plants

Q: I am long time customer of yours, I live in San Diego California and while the summer and Fall temperatures are warm to mild, the winter temperatures dip to a point where some tropicals die off. We are experimenting with different variations of way to heat and insulate the pots we have the tropicals planted in as a way to keep them alive during the colder winter months. I was wondering if you knew of the ideal soil temperature for these tropical in order to look their best year round. All of the heaters we have installed have thermostats and temperature adjustments so we can now keep the soil anywhere between a range of between 65-75 degrees. Any advise you can provide would be greatly appreciated.

A: This is a very interesting concept you are working with. Indeed, keeping pots/roots warm, may help a lot! We've been experimenting with cold protection for a long time - for the above-ground plant parts. For sure keeping roots protected (even with a thick layer of mulch) will benefit tropical plants during winter. In case with container plants, this may help dramatically.
The guideline is, tropical plants slow down or stop their metabolism at 65F. As long as you can keep soil above that temperature - this should work great. Of course, the higher the better.
Optimum temperature for growing tropical plants in general - 70-85F. Above 90F, metabolism stops too, unless it's a heat tolerant, desert plant.

Greenhouse in Virginia
Plumeria cold protection
Ghost Cold Protection
Seven rules of cold protection for tropicals
About Cold Protection
Cold protection - winter action for your plant collection
Tropical Treasures articles on zone pushing.

Healthy Plants: Q&A from Mr Booster

How not to kill gardenias?

Q: I have tried to grow gardenia in pots for years and never keep them alive. When i look on camellia websites they say fertilize potted plants twice a year. I'm confused as I tend to kill them with kindness haha. Also, if our tap water has high cal/mag and that stops the gardenia getting other nutrients why would I make up the feed with tap water? So confusing and online is mixed messages...

A: Gardenias are not the easiest plants to grow, however, they are easier in pots than in the ground: they prefer acidic soils, and in many areas soils are alkaline. The most important factor is balanced and sufficient nutrients. In the ground, plants have no limits to reach out to different elements by spreading their root system. In a pot, once all the good stuff is consumed, plants start suffering nutrient deficiency. This is why a balanced feeding program is important.

Generally speaking, Cal/Mag in tap water cannot be bad, because they are essential elements, good for plants (in proper amounts). However, just Cal/Mag is not enough. This is why you need a balanced liquid fertilizer for plants that prefer acidic soil. Excessive Cal/Mag alone can create nutrient lock up, especially if they are chelated with EDTA like in dry fertilizers, which are not fully accessible for plants.
We recommend natural, Amino-Acid based fertilizers that are completely consumed by a plant and are safe to use with EVERY watering, even in Winter. They are scientifically formulated and cover all plant needs. For your gardenias, you should use SUNSHINE Pikake - Fragrant Flower Booster.
Another important factor is proper watering. Gardenias like regular water but don't like wet feet = well drained potting mix is a must, similar to Abundance professional growing mix.

Healthy Plants: Q&A from Mr Booster

Feeding Indoor Plants

Q: I am moving all my potted plants indoors as weather is cooling down. I still have Sunshine Boosters that I got from you in Summer. Do I need to continue fertilizing and how often, or should I wait until Spring?

A: Indoor plants add a vibrant warmth to your home, and can even improve the air quality. But most importantly, indoor plants give you access to year-round gardening. While majority of house plants are easy to maintain, they still require proper care to thrive.
Too many gardeners overlook the importance of fertilizing plants indoors. However, proper feeding is essential to grow healthy, vibrant plants. With outdoor plants nature sends rain and a plant will send new roots to find food, an indoor plant is limited to only what you will give it. That is why it is essential to feed your plants a healthy nutritious meal even indoors.
Many granular and slow-releasing fertilizers will recommend that you only feed your plants occasionally, but this is not the healthiest for plants, since they need to "snack" every day to satisfy their daily nutrient needs. When you feed a plant a large meal rarely, it cannot absorb the nutrients effectively, leftovers creating build up in soil (it's called "locked up nutrients") and that is why we specifically designed our fertilizers to be a light, daily nutritious meal for your plants - Sunshine Home for houseplants...