PlantFiles: Golden Trumpet, Yellow Allamanda
Allamanda cathartica

I cut mine Allmanda to the ground right tbe for winter set in . The temp fell to 20 but when summer arrived the plant shot up like wild fire as if nothing had ever happen .

Seed germination went well for me...because of its strange texture and the age of the seed-(3 years), I decided to throw them in peroxide to soak. I did this 2 days, then I peeled the corky shell off and planted them in potting soil. 2 out of 4 seeds germinated within 3 weeks.
Now I have to ask myself-what will I do with these in my zone 4. I was just checking germination before I gave them away.

I fell in love with this plant when I was strolling through a nursery and brought it home--not knowing a thing about it. Although a climber, I'm going to try to grow it on my back deck in a pot and house it, during the winter, in a green house. I have taken it out of the ugly black planter it came with and planted in a beautiful basket weave pot: looks beautiful; however, a lot of the leaves are turning yellow. Hopefully, the yellowing leaves will stop after the plant has adjusted to its new home. If someone has a cure for yellow leaves, please advise.

I have two of these in my yard here in SW Florida. One is a very large mature plant growing against a trellis against the front of my house. The other is against a fence in my backyard. I've had that one for a few months, so it's still rather young, but was about three feet when I purchased it at a Lowe's here in Bradenton.

I don't know about other climates, but it has absolutely thrives here, but its growth and flowering rate seem heavily dependent on its sun exposure. The one in the front gets full sun most of the day; it's become very large, and spilling over its initial trellis with vast quantities of flowers. The other allamanda in the back in partial shade most of the day. It seems to be growing much more slowly, and has few flowers.

I haven't done much with this one but fertilize this spring. It does like water. I find that the one in full sun begins to wilt when it doesn't rain and I miss watering for a couple of days. I may move the smaller one into a more sunny location and see how it fares. They are beautiful and aside from needing regular watering, require little care here in southwest Florida.

Here in the Central Valley of Costa Rica, this wonderful vine blooms continuously throughout the year. It takes a long time for a hardwood cutting to grow roots, and to produce the flowers, but the wait is worthwhile. Then again, we just cut a branch off and place it in any available space! Doesn't seem to affected by any insects....and we have lots!

I have also seen miniature versions of this flower growing in Hilo

I immediately fell in love with the 1st one I ever saw (2002), bought it and, being end of season, left it in the nursery pot it came in. It was covered during the 19 degree freezes that winter. Come spring, trimmed the dead branches down to the ground, frequently checked for signs of life but found none.

In June the soil was emptied from the pot & the remnant below the soil line was tossed out in the potting area of my yard. 2 weeks later I noticed some green showing on the remnant I'd tossed out so I replanted it.

Today it has it's own place - growing on my back yard arbor. I made a vow to myself & my little plants to never toss any of them out until AFTER June.

This is one of the all times favorite shrubs. It´s one of the most commonly cultivated in Brazil, and still the most popular Allamanda. In the tropics, it blooms with full strenght on spring and summer, but it never really stops blooming - in mid winter you still can see yellow flowers here a there.

The white sap is poisonous. It doesn´t prevent attacks from aphids and catterpillars (I see enormous and colorful catterpillars - they are gorgeous - on those plants, and they eat everything - the moth, in other hand, us quite ugly), but is certainly dangerous for kids and animals.

This plant will bloom all summer if given enough light and warmth. It needs a cool, dry rest period in the winter. Don't overwater while it's resting, or you may cause the roots to rot.

Fast-growing evergreen woody stemmed climber with rich, bright yellow trumpet shaped flowers in spring, summer and early autumn. Good to grow up a trellis or allow to cascade over a low wall. Will benefit from regular feeding in the growing season. Whitefly and red spider mites may be a problem. Prune previous season's growth back to 1 or 2 nodes in spring. The stems must be staked and plant must be watered regularly if exposed to a full sun environment.