Most nicely pruned and healthy plants enhance good energy.
However…
What are some ‘BAD’ or CHALLENGING Feng Shui indoor plants?
Cactus plants (cacti) and other Thorny plants
Spiky and thorny plants are rarely admitted in Feng Shui gardens and homes; their thorns put out small amounts of bad energy. Over time this can cause sickness, loss and bad luck, so it is better to avoid those.
Bonsai
Bonsai are large trees that have been artificially stunted over the years. Although bonsai can be valuable, they are bad Feng Shui when grown indoors. Bonsai symbolise stunted growth, and can cause blocks in growth and business.
Plants that grow downwards
Don’t grow weeping willows, spider plants, ivy and other downward growing plants indoors. These draw energy downwards, when we want indoor plants to boost our energy.
Dead, sick and dying plants, and wilting cut flowers
These release negative energy and symbolise death. Throw them out. Keep only healthy plants and freshly cut flowers indoors. Replace dead and dying plants with healthy plants to boost Chi.
So for an harmonious INDOOR place, avoid bonsais, downward growing, dying and thorny plants.
Next post will be about GOOD plants!
Roseline Deleu, international Feng Shui Master & Metaphysical Teacher http://www.fengshuisteps.com/roseline.html
Feng Shui Steps 
Hi Roseline, Thanks for the tip on the meet up web site. There is so much happening
in Canberra. I have been to 1 event and rsvp”d to another. I hope you enjoy your cruise. Cheers N’dne