problem with skunk cabbage

weirdflowers(5)December 23, 2013

My Eastern skunk cabbages aren't doing so well. I believe it's a nutrient deficiency but I don't know what nutrient or how to fix the problem. There is very little cultivation information out there for this species, and none that I've been able to find about growing them in containers. I wouldn't expect anyone else here to grow these things and know exactly what's wrong, but if you've got any ideas or suggestions, that would be fantastic.

Here is one of the ailing plants:

Potentially useful info:
The potting substrate is basically 5-1-1 with less fines and are fertilized with Foliage Pro weekly. The pots are in a container of water ~1.5", which gets rinsed and replaced weekly. I believe overwatering is not a problem here--these are wetland plants that grow in thick, smelly mud; the roots on these particular plants seem very happy growing down below the water line; and allowing the substrate to dry out even a little bit for short amount of time killed several of the specimens I had.

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ken_adrian Adrian MI cold Z5

more info please ...

are you growing these in the house???? ... greenhouse.. ????

window light.. supplemental light ...

why would it need all that fert in winter.. in the northern hemisphere???

outdoors.. it would be dormant ... can it be grown year around??? ... does it 'need' a dormancy period??? .... i dont know ...

have you considered.. that you might be loving to death ... an endemic mud weed .. lol ... your media.. seems way beyond.. what you call.... 'thick, smelly mud'

i am just brainstorming for you ... sorry i cant give you a specific answer ....


    Bookmark   December 23, 2013 at 12:44PM
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morz8(Washington Coast Z8b)

I've never containerized it, here our western version just grows on its own ;)

Is that a mulch layer on top your potting medium or the medium itself. Their native soil would be very heavy (not chunky with bark) with organic matter, on the acid side due to the decomposition of that organic plant material.

The coloring of the leaves suggests chlorosis. That can be wrong soil ph, but anything that damages roots leading to their inability to take up nutrients can cause chlorosis soil too wet/dry, nematodes, and fertilizer burn. Weekly fertilizing sounds excessive to me, maybe about 4 times too excessive. Have you checked the root systems on any of your plants? It should be extensive with skunk cabbage - larger than you might expect given the plant size.

    Bookmark   December 23, 2013 at 2:12PM
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Leaves will indicate nutrient problems quite early, but diagnosing the problem can be difficult. Yellowing of leaves, often thought to indicate a Nitrogen deficiency has many causes including Iron deficiency. It is known that soil pH plays a major role in nutrient availability and that excess amounts of a nutrient can interfere with a plants ability to use others.
I would guess that since the OP is in Zone 5 that this is a houseplant, or maybe a greenhouse plant, which can indicate a whole bunch of other problems.

Here is a link that might be useful: leaves as indicators of nutrition

    Bookmark   December 24, 2013 at 8:22AM
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These plants are being kept indoors under T8 lights. The bark mix is the potting substrate, not just a top layer--I considered their natural habitat and soil type, but decided this mix would be best as it allows me to flush excess salts easily. The fertilizer schedule is not as intense as it might sound; they are given the recommended concentration and then sit in a container of water in which the nutrient solution is further diluted.

I've done a bit more reading after posting this and I believe, as you folks have mentioned, that pH may be a problem here. The fertilizer (Foliage Pro) contains all macro- and micronutrients in proper proportions. I'm going to try lowering the pH with vinegar and see how that helps.

    Bookmark   December 24, 2013 at 2:31PM
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morz8(Washington Coast Z8b)

The browning along the outer edges of your leaves looks more like fertilizer injury than ph issue.

I use any fertilizer product including Foliage Pro mixed at no more than half strength of the directions on the package, usually less than that. Nothing I've grown in containers (meaning countless perennials and shrub starts) has shown symptoms of needing more, ever. About once a month during the growing season only.

You may need to rethink your growing medium and for this particular plant, try to come closer to the natural preferred soil. Ease in flushing salts for you won't be helpful if the plant won't thrive in it ;)

    Bookmark   December 24, 2013 at 2:42PM
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Good point. Do you think I should try to approximate its natural soil in terms of water retention only, or in content as well?

    Bookmark   December 26, 2013 at 9:29AM
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