Inside or out, keep it neutral and use "pops" of color carefully!
Back inside for a moment, you can see 'white' is definitely the commonality between the two spaces but the backdrop changes the dynamics dramatically. For most of the world white is
the color associated with purity ; cleanliness and the safety of bright light. It is also used to project neutrality and is associated with creativity; it is a compression of all the colors in the
color spectrum and as long as it is not a 'glow in the dark' version of the color, the room can be 50 shades of white. Red on the other hand is the color of energy. It's associated with
movement and excitement. and people surrounded by red find their heart beating a little faster and often feel out of breath. It's absolute the wrong color for a baby's or bedroom but
perfect to get people excited. Red is not a good color to over use but using a spot of red in just the right place is smart in some cases (one red accent in a otherwise neutral room draws
the eye. So too in the garden, a little punch of red or a bright yellow will take you a long way. For a more relaxing space, choose calming, pastoral colors and if a punch is needed, it can always be added but if it's painted on two walls or there are twenty plants with flowers that in Crayola colors, it's now a make work project. Enjoy your space when it's done (for now), you
can always change it late but don't make CHANGE part of a plan if starting fresh; it takes long enough to get it right (or close) the first time around and necessary change will
happen, regardless!