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Questions about Cyathea cooperi leaf browning
androctonus
Posts: 1
Hi, I am a gardener who is keeping a coin spotted tree fern, Cyathea cooperi.
In where I live, this species is very hard to obtain. Therefore, I imported this species from overseas. However, due to some delays in shipping, the plant arrived in a terrible shape. So I letted it recover in a low-light, humid environment(relative humidity 90-100%).
Luckily, the tree fern seemed to like this environment and started to root out and unfurl new fronds. After checking the first normal frond, I located this plant in a small green house (figure 1.),for it could still not adapt to the normal living space humidity(in my case, 50~60%).
The small green house is equipted with 24/7 hours of plant growth light(about 10000~15000lux when measured from the fronds) and has a hole for ventilation(an air circulation device is on 24/7 in the room where this plant lies.) the temperature varies between 23 degrees celcius and 26(+I set the humidity by spraying water on the bottom of the small greenhouse, and never letting the water to touch the plant. The humidity is usually 99%,and I spary the greenhouse when the humidity falls to about 95%. +the tree fern was never watered after moving over to the small greenhouse.).
And here's the real problem. After moving over to the greenhouse, the treefern started to unfurl more fronds rapidly. However, the fronds that were unfurled at the low-light, humid environment started to turn yellowish from the vein(figure 2., 3.), and brown spots appeared on the fronds(figure 2., 3.). The brown spots expanded to a certain size and stopped getting bigger(figure 3.). This phenomenon was also repeated from the next new frond that was unfurled in the small greenhouse. Moreover, this phenomenon was not observed from the fronds that were on from the arrival.
Additionally, some of the frond's edge that were unfurled in the small greenhouse started to turn blackish-brown(figure 4.).
I thought these problems would have risen due to overwatering(or high humidity in roots) and low ventilation. But, the treefern cannot still tolerate humidity lower than 85%, so I couldn't place them in a low humidity environment to take care of the overwatering and I just really don't know how to solve nor identify the cause of this problem. Therefore, I'd really like to ask experienced gardners in this forum about this problem.
Thanks for reading this long text 😁
Best, Jimmy.
(Figure 1.)
(Figure 2.)
(Figure 3.)
(Figure 4.)
In where I live, this species is very hard to obtain. Therefore, I imported this species from overseas. However, due to some delays in shipping, the plant arrived in a terrible shape. So I letted it recover in a low-light, humid environment(relative humidity 90-100%).
Luckily, the tree fern seemed to like this environment and started to root out and unfurl new fronds. After checking the first normal frond, I located this plant in a small green house (figure 1.),for it could still not adapt to the normal living space humidity(in my case, 50~60%).
The small green house is equipted with 24/7 hours of plant growth light(about 10000~15000lux when measured from the fronds) and has a hole for ventilation(an air circulation device is on 24/7 in the room where this plant lies.) the temperature varies between 23 degrees celcius and 26(+I set the humidity by spraying water on the bottom of the small greenhouse, and never letting the water to touch the plant. The humidity is usually 99%,and I spary the greenhouse when the humidity falls to about 95%. +the tree fern was never watered after moving over to the small greenhouse.).
And here's the real problem. After moving over to the greenhouse, the treefern started to unfurl more fronds rapidly. However, the fronds that were unfurled at the low-light, humid environment started to turn yellowish from the vein(figure 2., 3.), and brown spots appeared on the fronds(figure 2., 3.). The brown spots expanded to a certain size and stopped getting bigger(figure 3.). This phenomenon was also repeated from the next new frond that was unfurled in the small greenhouse. Moreover, this phenomenon was not observed from the fronds that were on from the arrival.
Additionally, some of the frond's edge that were unfurled in the small greenhouse started to turn blackish-brown(figure 4.).
I thought these problems would have risen due to overwatering(or high humidity in roots) and low ventilation. But, the treefern cannot still tolerate humidity lower than 85%, so I couldn't place them in a low humidity environment to take care of the overwatering and I just really don't know how to solve nor identify the cause of this problem. Therefore, I'd really like to ask experienced gardners in this forum about this problem.
Thanks for reading this long text 😁
Best, Jimmy.
(Figure 1.)
(Figure 2.)
(Figure 3.)
(Figure 4.)
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