If there have been problems with the reticulation and you have reported this issue to the property manager, and did not otherwise cause them, then you should not be responsible for the plants.
If it is unclear why the reticulation has failed, you won't be responsible unless they can identify and prove that something you did has caused it's failure, unless it has been a long standing failure which you have not reported.
For more general information on your rights and obligations as a tenant, see the following link:
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If the manager is happy and the owner is unhappy it is really just a sign that either the manager is too easy going or the landlord is unreasonable. In either case, you can only deal with any specific complaints that the owner makes when they occur.
Your legal rights ultimately depend on the merits of any particular issue, and not whether you have a fussy landlord or not. The fact the managing agent has been happy is, however a promising sign.
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