I have a large plant that had 13 blooms open last night, with 5 or 6 more to open tonight. I am wondering if I should remove the spent blossoms today, or let them fall off on their own.
It's your preference. If you like a tidier look, go ahead and remove them. They only bloom for one day, so after opening in the evening, they wither by morning.
My night blooming cereus had 1 beautiful bloom earlier this year but since then only several little buds that opened prematurely and fell off before they fully opened. What is causing this?
Unfortunately, your photos did not come through. Seeing the plant, and surrounding area, can help to get a better picture of any environmental conditions that will attribute to this.
Many things can cause lack of blooming, and bloom drop. The first things to check will be soil nutrient content and pH. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
Once you rule out nutrient or pH issues, you can begin to diagnose diseases. Overwatering is the leading cause for disease for these tropical cacti.
They can go long periods without water, and do not tolerate wet feet very well.
Here is an article that will help:
I just receiving a dry cutting.
Callus looks like a scab on the cut end. It will happen as the cut end dries.
Here is an article that will offer more information:
This night blooming cereus is new to me and just a young plant. It came with a few brown spots on the leaves. I don't see any type of insect on it. It is a house for me.
If the spots are just on a few leaves, go ahead and remove the leaves.
If the spots spread to more leaves, it may have a leaf spot disease and need treatment.
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm
night blooming cereus: live in coastal north carolina 1. plant long and gangly, want to move outside on deck; does the direct sunshine burn the plant, or humidity bother it 2. if plant is outside, whats the lowest nighttime temp I need to worry about? when to bring it back in 3. how often to water, husband thinks it needs to be damp all the time, I dont!
This plant can handle high temperatures of 100 degrees F if you give it a bit of light shade to prevent sun scorch. If the temperature is going to drop below 50 degrees F, you may want to bring it in. Since it is a cactus, it doesn't like to sit in soggy soil, so water its well-draining soil when it feels dry. https://www.gardeningknowhow.com/ornamental/cacti-succulents/night-blooming-cereus/night-blooming-cereus.htm
My plant has become unweildy, and I can no longer move the pot to get it inside for the winter.
This one roots very easily and quickly! You can cut anywhere, but cutting at a joint will be the most successful. The most important step will be to let the cut callus before putting it into soil.
This article will help:
This article will help you with the care of the plant:
I have a night blooming cereus that has always been healthy but looks as if something is eating on it not sure what I need to use on it somethings I have read say spray with neem oil extract others say not. Any advice or help please.
I would try other things before I would try Neem oil. It can be a bit harsh on many plants. If you do decide to try Neem, make sure that you try it on a very small portion of the plant, first.
Here are some articles to offer more ways of dealing with insect pests:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm
Here is an article to help you with the care of the plant: