Hello everyone - I have had a Cordyline for about 6 months, and repotted it about three weeks ago into a slightly larger terracotta pot. I don't know if it is a coincidence but in the last week or so I have noticed yellowing lower leaves, which have worsened and crept up and now about a third of the plant is affected. It is still producing new leaves but I am anxious that it might be dying! I have also noticed some red blotches on a few of the leaves, and also some white chalky residue on the stem..... Any advice would be most welcome! Thanks.
Cordyline Fruticosa
- Thread starter SteveP
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Welcome to the forum and hope the following is useful to you.
Incorrect watering, including a lack of regular watering or repeatedly allowing the soil to dry out completely between waterings, can lead to leaf tip and margin burning. Too little water can also cause stunted growth and leaf yellowing and drop.
Brown Leaves on a Cordyline | Home Guides | SF Gate
https://homeguides.sfgate.com/brown-leaves-cordyline-68680.html
Here something from RHS
Problems
Cordyline plants can develop spots on their leaves, often in response to physical damage or stress such as exposure to cold wind, hail and winter wet.
Wet and cold weather in winter, and drought and heat stress in summer, can lead to poor growth, yellowing and browning of the foliage or excess leaf drop. Improve the growing conditions and provide winter protection.
Winter damage can also cause dieback of the crown. To avoid this, provide winter protection. Where it has happened, remove the affected growth. The plants usually regenerate from the bare stems or produce suckers at the base.
Damage to the bark following a hard winter can also be associated with an infection known as cordyline slime flux.
Incorrect watering, including a lack of regular watering or repeatedly allowing the soil to dry out completely between waterings, can lead to leaf tip and margin burning. Too little water can also cause stunted growth and leaf yellowing and drop.
Brown Leaves on a Cordyline | Home Guides | SF Gate
https://homeguides.sfgate.com/brown-leaves-cordyline-68680.html
Here something from RHS
Problems
Cordyline plants can develop spots on their leaves, often in response to physical damage or stress such as exposure to cold wind, hail and winter wet.
Wet and cold weather in winter, and drought and heat stress in summer, can lead to poor growth, yellowing and browning of the foliage or excess leaf drop. Improve the growing conditions and provide winter protection.
Winter damage can also cause dieback of the crown. To avoid this, provide winter protection. Where it has happened, remove the affected growth. The plants usually regenerate from the bare stems or produce suckers at the base.
Damage to the bark following a hard winter can also be associated with an infection known as cordyline slime flux.
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Welcome to the forum 
Could you tell us more about the conditions where it is situated - eg how much sun it gets, how warm it is, how much water you give it, etc. Also does the photo show the new plant pot or the previous one?
Could you tell us more about the conditions where it is situated - eg how much sun it gets, how warm it is, how much water you give it, etc. Also does the photo show the new plant pot or the previous one?
Hi guys, thanks for your replies
The plant has been on a high shelf in a large bright room for the past three months, without any direct sunlight - I'd read somewhere that they don't like full sun, but have also read recently that they can cope with near-full sun?! The photos show the new (current) plant pot - before that it was in a smaller plastic pot. I have been conscious to not overwater, only watering when the soil is dry - in its previous pot I was able to lift the plant out of the pot and check the roots and soil but since repotting I don't want to disturb the adjusting roots! I used potting soil to repot and put a layer of small stones at the base to help drainage.
The plant has been on a high shelf in a large bright room for the past three months, without any direct sunlight - I'd read somewhere that they don't like full sun, but have also read recently that they can cope with near-full sun?! The photos show the new (current) plant pot - before that it was in a smaller plastic pot. I have been conscious to not overwater, only watering when the soil is dry - in its previous pot I was able to lift the plant out of the pot and check the roots and soil but since repotting I don't want to disturb the adjusting roots! I used potting soil to repot and put a layer of small stones at the base to help drainage.
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I'm not sure to be honest... It doesn't sound like you're overwatering, if anything you may be underwatering but if that's the case I'm not sure where the white stuff is coming from. Hopefully someone will be able to help shed some light on this!