How to get Passion Vine to flower?
From Mark Hooten, the Garden Whiz

Q: Several months ago, I purchased a passionflower vine, a red one with lots of flowers. I ended up putting it in a much larger pot with a large trellis, using a popularly advertised bagged potting soil recommended at a big box store. I have given it a blue colored water-soluble fertilizer every couple of weeks as recommended. However, while the vine seems very happy, growing faster than i can keep winding it around the trellis, it has not flowered all summer. I there something I am doing wrong?

A: Passionvines as a group (and there are some 500 different kinds!) are sort-of unusual among popularly grown ornamentals because they have "nitrogen issues". This is because, even though unrelated, they are much like most legumes, as they maintain a symbiotic relationship with certain beneficial soil bacteria which allows them to gather atmospheric nitrogen and store it in their roots. When they have an overabundance of nitrogen, they simply stop flowering and produce rampant leafy growth while never flowering. They only flower well after a period of healthy vine growth, because the plant had finally used up all of its stored nitrogen.
Since you had both used a bagged potting soil which likely already contained fertilizer with nitrogen added, as well as bi-monthly doses of a liquid fertilizer which also contains nitrogen, it has been receiving so much nitrogen it only knows to grow more vineage until the nitrogen is used up. If and when that happens, it will again begin to flower. This rule applies of course not only to flowering but also to fruiting varieties of Passiflora: the more flowers, the more fruit you get!
So the answer is - for the time being, just stop giving it supplemental fertilizer and it will start flowering for you sooner than later!

See all passion vines from TopTropicals.

A Sacred Earthworm: benefit or damage?

by Mark Hooten

Q: We have lots of earthworms in our soil. I've heard they are beneficial for the plants, it it true? Or should I try (and how) to get rid of them at least for container plants?

A: From my earliest childhood, I remember learning that "earthworms" are wonderful, beneficial creatures for our gardens. I had heard that they improved the soil by both aerating it via the tiny tunnels they dig from burrowing activities, AND leaving their droppings which act as fertilizer. However, both my personal experiences and studies have shown otherwise. The truth is that the vast majority of earthworms we encounter in our daily horticultural practices are not even native to North America. In fact, they were introduced from Europe, beginning with the colonial period, mostly accidentally in things like the ballasts of ships, and from soil from around the roots of plants being imported. However, once they arrived here, they began to irreparably alter the natural eco-systems of our forests... Continue reading...

Season Colors from Kristi, TopTropicals Flower Queen

Q: I live in New Jersey and I have a collection of potted tropical plants in my sun room. Our Fall season comes in bright colors, do you have something with colorful foliage for Fall?

A: For our northern customers it's almost time for the changing of the seasons. It is a very exciting and enjoyable time. The onset of fall means, less humidity, cooler nights and the Fall foliage. Here in Florida we do not get the chance to see the changing of the leaves, except maybe a few like Florida Maple Tree. So we use plants that mimic the season change, for all year round color! These are a few examples of the plants with colorful leaves that you may use for your Fall colors, plus remember - there is always a big list of Fall and Winter Flowering Tropicals!

Colorful tropical plants for Fall

Hibiscus tiliaceus - Variegated Mahoe
Acalypha wilkesiana - Chicago Brick Copper Leaf - see all acalyphas
Mussaenda philippica x flava - Calcutta Sunset Marmelade
Pseuderanthemum atropurpureum Purple Haze
Acer rubrum - Red Maple
Adenium Nil with red veined leaves
Cerbera x manghas hybrid - Enchanted Incense
Cordyline fruticosa Willies Gold - see all codyline
Graptophyllum pictum Chocolate Queen

See Fall and Winter Flowering Tropicals.

6 reasons to buy tropical plants in Fall

1) Easy planting. No sweat. Enjoy your gardening fun during cooler weather!

2) Easy shipping. With cooler weather, there are less chances for the mail order plants to get overheated in transit or at your doorstep in case you miss the delivery. But don't wait too long, another few weeks and too much cold will put another restriction for deliveries up North.

3) Easy establishing. Stress-free roots = stress-free plants = happy gardeners. Cooler weather is always better for planting and quick establishing.

4) Easy maintenance. Plant growth rate slows down during cool period, so your garden maintenance will be minimal.

5) Winter bloomers will brighten your days! Look at these winter-flowering plants that create a spectacular show during Fall-Winter in subtropical climates. If you grow them as houseplants, this is your chance to have flowers in Winter!

6) House plants Many tropical species suitable for indoor cultivation are available year round, but when you buy them in Fall - they are in their fullest and best shape after Summer vigorous growth.

One the photo: Barleria cristata Striped Lavender Lace.

Checklist - Preparing for winter in subtropical areas

Watering. Start reducing the amount you water your plants in early fall, once the temperature drops below 65F. Avoid watering your plants during cool nights, as this may cause serious root rot.

Mulch. When a plant is protected by a thick layer of mulch, the root system stays healthy.

No Pruning. Avoid pruning, trimming, or pinching branch tips altogether during the fall and winter which encourages new shoots that are soft, tender, and very cold sensitive. Last trimming should be done no later than September - early October.

No Fertilizer. Avoid fertilizers during the winter. The main reason being the same as above for pruning: fertilizing promotes growth of the upper plant parts which should be avoided during the winter months. The last time for fertilizer should be no later than October.