Hi , I'm James DVM MRCVS and would like to help you with your question
There could be several reasons for Mishka to be going about digging in the garden .
It could be a behavioral issue , Malamutes are very active dogs , at times if they are not simulated enough , they can start acting strange by releasing their stored energy in any way possible . treating up furniture indoors , plants outdoors and such other bad acts.
Another possibility could be that Mishka is following up on smells of other animals , could be cats , foxes, badgers which mark their territory in your garden and that is driving her wild (being a hunting dog by origin)
Mishka is eating several types of plant and I want to know wether they are poisonous otherwise she is happy and content
that is not a problem : I found a number of websites which could be of help to you:
This one will help you with you need of Geraniums as they are considered toxic to dog, though is requires a large amount
in regards XXXXX XXXXX more generalized notion of which plants are toxic , I attach the following list of common garden flowers and thier level of toxicity - http://www.dogstrust.org.uk/az/factsheetsanddownloads/factsheetpoisonoussubstances09.pdf
In general neither of the two plants you have mentioned are extremely toxic and would usually result in vomiting as a first line of defense. Geraniums has been known to cause some skin reactions which can look like hives , this is more common to dogs which light colored fur which hold more sensitive skin but 9 out of 10 times you would see nothing and it shall pass.
The most dangerous outcome would be in actuality uncontrolled vomiting which could lead to dehydration , and especially on days such is these and that is what you out look out for the most
In case a skin reaction does develop , and Mishka is itchi and uncomfortable , you can administer one tablet of piriton 4mg up to three times a day (do it for one day only ) and that will help resolve the signs
I hope this helps , do you wish to ask anymore on the subject as I am here to help
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If you wish to ask anything more let me know.