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Table 4.11

Cultivation of Cannabis Plants

1. Have you ever grown cannabis plants?

n

%

Yes

739

60.1

No

491

39.9

Base

1230

Response Rate

(% of all respondents)

92.3

2. What sort(s) of seeds or stock did you last grow from?

Type(s) of seeds

Total

(exclusive)

Total

(inc. combinations)

% of growers

Hemp

80

109

16.2

Imported Bush

257

337

49.9

Pedigree Seeds

157

239

35.3

Cuttings

72

124

117.9

Base

670

Response Rate

(% of growers)

90.7

3. What growing method(s)?

Method

Total

(exclusive)

Total

(inc. combinations)

% of growers

Outdoor

99

165

23.4

Greenhouse

66

98

13.9

Indoor

410

501

71.2

Hydroponics

25

54

7.7

Base

704

Response Rate

(% of growers)

95.3

4. What type(s) of lighting?

Lighting

Total

(exclusive)

Total

(inc. combinations)

% of growers

Natural Light

474

514

76.6

Gro-lux

65

98

14.6

Metal Halide

21

62

92

HP Sodium

41

81

12.1

Total High Intensity

112

16.7

Base

671

Response Rate

(% of growers)

90.8

Table 4.12

Number of plants grown on last occasion

Number of Plants

n

%

1-5

356

50.0

6-10

150

21.1

11-15

57

8.0

16-20

43

6.0

21-30

22

3.1

31-50

29

4.1

51-100

22

3.1

101-300

12

1.7

>301

4

0.6

Mean No. Plants

19.2

Base

695

 

Table 4.13

No. of plants grown by frequency of cannabis use

Frequency

n

Mean No. plants

St. Dev

Std Error

Experimental

13

9.0

13.0

3.6

Occasional

70

5.5

9.4

1.1

Regular

114

15.4

36.6

3.4

Daily

483

22.9

108.1

4.9

Other

15

7.1

12.2

3.1

Total

712

19.2

90.6

3.4

Table 4.14

Cannabis use Indices by number of plants grown

Monthly Cannabis Use (g)

No. of plants grown

Mean

Std Dev

Non Growers

19.9

50.7

10 plants or less

25.4

25.4

Over 10 plants

37.0

42.2

1 Factor ANOVA

p <

.0001

Monthly Cannabis Purchase (g)

No. of plants grown

Mean

Std Dev

Non Growers

28.6

110.7

10 plants or less

52.1

140.8

Over 10 plants

64.9

168.9

1 Factor ANOVA

p =

.0015

Monthly Cannabis Spending (£)

No. of plants grown

Mean

Std Dev

Non Growers

48.6

59.4

10 plants or less

74.9

92.3

Over 10 plants

87.6

115.9

1 Factor ANOVA

p <

.0001

No of Spliffs Smoked per day

No. of plants grown

Mean

Std Dev

Non Growers

4.6

4.3

10 plants or less

6.7

5.6

Over 10 plants

7.8

6.6

1 Factor ANOVA

p <

.0001

No of Spliffs Rolled per day

No. of plants grown

Mean

Std Dev

Non Growers

3.9

4.0

10 plants or less

5.7

5.4

Over 10 plants

6.8

5.7

1 Factor ANOVA

p <

.0001

No of Pipes/knives Smoked per day

No. of plants grown

Mean

Std Dev

Non Growers

1.6

3.0

10 plants or less

2.4

3.9

Over 10 plants

4.2

5.7

1 Factor ANOVA

p <

.0001

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