Will these work on 4 year old logs, bark still attached, that previously had been used for mushrooms but they've stopped growing?

I would be cautious. In my opinion (I’m no expert) I would be concerned that the mushroom flushes you’d eventually get may be from another colony of unidentified or possibly poisonous variety. I cut down a tree, wait 3 weeks for the trees natural enzymes which prevent fungal growth to break down and then inoculate those logs. This way I can be reasonably sure the shiitake mycelium gets there first and lessens the possibility of some other not so edible variety showing up. Again I’m no expert which is why I don’t trust my ability to identify mushrooms by sight alone. My logs sit in a damp dark part of my woods where all sorts of nasty fungi grow, at least I can be reasonably sure that the mushroom that looks like a shiitake growing from the hole I put a plug in, is in fact a shiitake.

do they reproduce or have to ise more pligs for more mushrooms?

Set up correctly, the fungus colonize the log, thereby allowing it produce mushrooms for years to come.

They didn't work for me at all in the recommended oak log.

Can you use candle wax to cover the openings?

I bought this kit a while back, followed the instructions, the whole project was a failure. The wax they provide is candle wax. (paraffin) If I were to do it again I would use beeswax.

Indoor/Outdoor Usage	Outdoor
Brand	2funguys
Material Feature	Organic
Item Weight	10 Ounces
Sunlight Exposure	Full Sun
Net Quantity	1.0 Count
USDA Hardiness Zone	11
Moisture Needs	Moderate Watering
Number of Pieces	100
Item model number	shiwax
Package Dimensions	25.1 x 17.5 x 5.31 cm; 283.5 g
ASIN	B06Y28J9RR

Spawn and Wax Combo - Shiitake Mushrooms Mushroom Mycelium Plug Spawn - 100 Count Plugs - 3oz Wax Grow Edible Gourmet & Medicinal Shitake Fungi On Trees & Logs

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