A Comparison of Plant Growth
A study done by members of the TFSS plants association
The Plants We Chose
This is a cactus of the species Arrojadoa bahiensis. It's characterized by its thin, long spines and distinct pink flower. As cacti are very difficult to grow in Canada's conditions, we've picked up one that has already grown to 15 centimetres.
Pictured to the left is our favourite species of tulips, Tulipa liliaceae. They have colourful bulbs, with tall stems. We grew the tulips from 3 centimetre sprouts, and so far they've had an abundance of buds.
Using the Information
8 weeks after getting our plants, both our cactus and our tulip were at the same height: 19 cm tall.
In the tables below, x represents the number of weeks spent growing the plant, while y represents the height of each plant in centimetres. Since we didn't grow the plants from seeds, both lines do not start from the origin.
The slope of the cacti's line is 0.5, and the tulip's slope is 2. These values represent the weekly growth for each plant.
For the cactus: Height = 0.5(Number of Weeks) + 15
For the tulip: Height = 2(Number of Weeks) + 3
Using this information, we can predict how long each plant will take to grow to its maximum height. Cacti can grow to a height of 101 cm, while tulips only grow to 30.5 cm.
Cacti will take 172 weeks (around 3.3 years) with maximum care to grow to its tallest height, and tulips will take 13.75 weeks (around 3 months) to grow to its tallest height.