We’ve been impressed with the performance of this striking very upright globe mallow. Spikes clad in soft orange flowers appear continuously for months in summer. To 4′ tall ultimately this forms a semi-woody clump to 2′ wide. Full, HOT sun and WELL DRAINED soil with light summer water. Freezes back in winter almost to the ground and vigorously resprouts for the base and grows quickly when hot weather arrives. Excellent on slopes, hot gravel gardens. Not bothered by rust or other diseases that can afflict mallows. Mulch lightly for the first winter for added protection. Stunning in bloom and carefree once established. Cut back dead top growth in mid-spring. Some deer resistance. Takes blasting reflected heat well. SW native plant.
Plant Type: Sub-shrub
Sub-shrubs are best thought of as woody perennials that can freeze to the ground in winter and regrow from the base in spring. Hardy Fuchsias and Abutilons are two examples of commonly grown sub-shrubs in our climate. The harshness of winter determines how sub-shrubs behave. In colder than normal winters (below 20ºF) they will likely freeze way back or to the ground. Mild winters may see no dieback at all. Refrain from cutting these back until you see new growth emerge- then you’ll know what to remove. Also, if an Abutilon has frozen back (and it will look awful and dead) simply water and water and water well into summer and the recovery that emerges is stunning. A little handful of all organic fertilizer in spring feeds recovery as well. For lightly tender sub-shrubs (zone 8a) and warmer it benefits these plants if they are planted deeply. Sink the crown of the plant 3″ below the soil level and mulch. This adds cold tolerance. Often slightly tender subshrubs will gain hardiness with age when treated this way.
Climate Adapted Plants for Gardeners in the PNW
Tibouchina urvilleana
Princess flower is a tender shrub that becomes a rapturous cloud of velvet purple flowers for all of summer. Three inch wide flowers have the wonderful backdrop of velveteen clad deep green leaves. To 4′ x 4′ in a seasonal container. Full sun to very light shade and rich soil with regular water. Appreciates a handful of all organic fertilizer halfway through the season. Over winter containerized plants in an unheated garage. Cut back hard, fertilize and place outside when all danger of a freeze has passed. In very protected gardens near the beach this shrub may be grown in the ground. To 8′ tall x 4′ wide. Freezes back below 27ºF and is root hardy to the low 20ºs. Mulch in autumn. Princess flower hails from the mountains of Brazil.
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