I live in AZ. Will rhubarb grow well in a large container here?
Yes, you can grow rhubarb in your warmer climate, but you should place the pot in a shaded or dappled spot and be sure to protect the plant from sunburn. The soil needs to be well-draining, too. Here are a couple article that will help:
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/rhubarb-in-hot-climates.htm
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/growing-rhubarb-in-pots.htm
Last year lots of rhubarb stalks had black puncture marks oozing sticky liquid. #1.What causes it? #2 Is it safe to eat the stalks with this problem?Binned them all last year. #3 How to prevent the same this year?see a few stalks coming up. Thank you
Unfortunately, your photos did not come through. I am unable to see the damage. It sounds like an insect has pierced the stalks causing damage. I would use insecticides (natural, if you prefer) and fungicides to correct any issues left behind be the insects.
It will, likely, be safe to consume. Less dangerous than the plant, itself.
These articles will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/garden-how-to/info/homemade-fungicide.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/harvesting-rhubarb.htm
Recently bought it at a gardening centre. The plant looked healthy. But it started to develop some yellow and Brown leaves. Also the stems seem very spindly. Don't know what I'm doing wrong. Planning to keep it in a pot. Can we still harvest the stems?
our container may not be deep enough. Rhubarb has an extensive root system. It should be at least 20 inches deep and wide. Do not harvest rhubarb till the second year. Here is more:
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/growing-rhubarb-in-pots.htm
My rhubarb is producing masses of very thin sticks. It has attempted to flower and I cut this out immediately. I keepit well watered and it is planted in compost mixed with farmyard manure. Why are the sticks so thin & is it OK to harvest and eat,
It sounds like the soil may be too fertile. Compost and manure are both amendments. Manure should be composted before it is used. Try mixing in a little garden soil. It also could be because the plant is devoting its energy to producing flowers. It should be OK to eat.
Here are more reasons for spindly stems:
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/spindly-rhubarb-stalks.htm
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/rhubarb-bolting.htm
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm
I have been told not to harvest in the first year. I was wondering what I have to do with it approaching the colder months.
Just leave it until the growth dies off. Once it is dead, you can cut it, or wait until spring!
Should we pull any out before winter??
I would not do any trimming until next year! This may harm them. Here is an article for more information:
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm
Do I cut them down before winter or let them die off
Let them die off so that your plants may store nutrients for the first year. Here is an article that will help with the care of the plant:
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm