I moved into a house and the owners left a huge potted yucca in the kitchen. It gets a great deal of light. I've been here 7 months and it is starting to turn brown, sag and the tips of the leaves are turning brown. It is a BEAUTIFUL plant and I want to save it. Any advice? I think I was watering it too much, but have since backed off.
Overwatering is the first problem to look into when you see brown tips on the leaves. Basically, yuccas like to get ALMOST dry between waterings. In order to be sure of what you're doing, you'll want to test the soil moisture before watering. Also, you need to know about the moisture in the bottom of the pot, not just near the surface. Use a long wooden dowel, or a shish kebob skewer, and test as if you were testing a cake. " Almost dry" will leave only a few bits of soil sticking, and the skewer will feel almost dry, only the barest trace of moisture. If you were overwatering, and now you're reducing water, it will still take the plant a long time to recover, although yuccas are pretty tough, so it should eventually. You can carefully trim off the brown tips, preserving the natural shape of the leaves. If the leaves no longer are tipping, you are on the way to recovery.
it has black spots on it and on some of the leaves are turning brown on the tips like they are dieing
It sounds like it has black spot fungus. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm
Is it possible for me to plant a Yucca plant that I have had for many years, and is now extremely large outdoors? Will it survive in the winter months ahead if I do?
Since you didn't specify in which zone you are considering planting, the answer is, "It depends." The "indoor' yucca will tolerate rather cool temperatures, down into the 30's for stretches of time. However, if your winters have temps into the lower 20's or below more than 2-5 times a year, the yucca may not survive. You could plant and be prepared with blankets for protection in the coldest weather if it's infrequent. These are tough plants, and withstand more than you'd think. Just don't keep them really moist during cold weather.
Have you considered pruning the plant if it's too big? A sharp saw can be your best friend with these plants. At least that's been my experience. They send up new growth quickly and instead of single stems, they develop their own character when pruned.
My indoor yucca plant, which has a trunk, loses leaves every winter. They are usually from the bottom of the growth of leaves and they droop, then go yellow and die. It is regularly fed in growing season and is not pot bound. I do water every couple of weeks in winter so as not to over water. It is moist at the moment and watered a week ago and leaves are starting to die again like last year.
Most likely you are watering it too much. Wait until the soil in the pot is completely dry before watering. Also, in winter plants need less water...usually only once a month.
We're having a dry season this summer in Auckland. One of my Yuccas is potted with cactus mix but is looking very sick. There's quite a lot of what looks like yellow mold. When the leaves are dead, I strip them off but I'm noticing it's starting in circular shapes and spreading. Most worrying is the center top, which is detaching itself and the leaves are fanning out blunt and square. How can I help the plant? I've been known to over water my money tree,s so I've held back from watering them and let nature do its thing, thinking it was mold needing to dry out. The other large one in a smaller pot has been doing great. Grateful for some advice.
It does sound as if over watering may be the issue with a fungal infection, or even root rot, being the end result. These plants are drought tolerant and require little watering, only when really dried out. Backing off on the watering is a good first step. If it's simply a fungus attacking the plant, you may be successful with fungicide. Root rot is a bit trickier, however. These articles will help, depending on your situation: https://www.gardeningknowhow.com/plant-problems/disease/root-rot-in-garden-plants.htm, https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm
We have an indoor yucca, which has flowered. This flowering seems to be very, very strong smelling more in the evening time than daytime. Is this normal?
Yes, this is common. Many plants have stronger scents in the evening because the types of insects that pollinate them are more likely to come out at dusk and early evening. It is meant to attract them, but humans can enjoy it as well.
I have 2 yuccas in pots, 2 metres tall. If I prune 1/2 metre off top, will it grow back the same? Some of the leaves have developed black strips on them and others look like they are dying from the middle of the leaf.
This article will help with pruning your yucca plants: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plants-care-and-pruning-tips-for-pruning-a-yucca.htm